Restore compact Changes diff controls (#1945)

* feat(app): restore compact Changes diff controls

Keep the folder tree behind a view toggle while preserving the flat file list as the default.

Move secondary diff options into the overflow menu so the Changes toolbar stays compact.

* fix(app): mirror whitespace diff option copy

* fix(app): polish diff controls review follow-up

packages/app/e2e/diff-row-alignment.spec.ts

@@ -218,6 +218,38 @@ test("changes diff keeps code rows aligned with the gutter", async ({ page }) =>
   });
 });
 
+test("changes diff switches between flat and tree file lists", async ({ page }) => {
+  const workspace = await createWorkspaceWithMountedTabDiff();
+  await useUnwrappedDiffLines(page);
+  await openWorkspaceChanges(page, workspace);
+
+  await expectFlatFileList(page);
+  await expect(page.getByTestId("changes-toggle-layout")).toBeVisible();
+  await expect(page.getByTestId("changes-layout-unified")).toHaveCount(0);
+  await expect(page.getByTestId("changes-layout-split")).toHaveCount(0);
+
+  await page.getByTestId("changes-options-menu").click();
+  await expect(page.getByTestId("changes-options-menu-content")).toBeVisible();
+  await expect(page.getByTestId("changes-toggle-whitespace")).toContainText("Hide whitespace");
+  await expect(page.getByTestId("changes-toggle-wrap-lines")).toContainText("Wrap long lines");
+  await expect(page.getByTestId("changes-refresh")).toContainText("Refresh");
+  await page.getByTestId("changes-toggle-whitespace").click();
+  await page.getByTestId("changes-options-menu").click();
+  await expect(page.getByTestId("changes-toggle-whitespace")).toContainText("Show whitespace");
+  await page.keyboard.press("Escape");
+
+  await scrollToLowerUnwrappedDiffRows(page);
+  await page.getByTestId("changes-toggle-view-mode").click();
+  await expect(page.getByTestId("diff-folder-src")).toBeVisible();
+  await expect(page.getByTestId("diff-file-0")).toBeVisible();
+
+  await page.getByTestId("diff-folder-src-toggle").click();
+  await expect(page.getByTestId("diff-file-0")).toHaveCount(0);
+
+  await page.getByTestId("changes-toggle-view-mode").click();
+  await expectFlatFileList(page);
+});
+
 test("changes diff keeps unwrapped gutter and code rows aligned after code size changes", async ({
   page,
 }) => {
@@ -266,13 +298,24 @@ async function useUnwrappedDiffLines(page: Page): Promise<void> {
     ({ preferencesKey }) => {
       localStorage.setItem(
         preferencesKey,
-        JSON.stringify({ layout: "unified", wrapLines: false, hideWhitespace: false }),
+        JSON.stringify({
+          layout: "unified",
+          viewMode: "flat",
+          wrapLines: false,
+          hideWhitespace: false,
+        }),
       );
     },
     { preferencesKey: CHANGES_PREFERENCES_KEY },
   );
 }
 
+async function expectFlatFileList(page: Page): Promise<void> {
+  await expect(page.locator('[data-testid^="diff-folder-"]')).toHaveCount(0);
+  await expect(page.getByTestId("diff-file-0")).toContainText("use-mounted-tab-set.ts");
+  await expect(page.getByTestId("diff-file-0")).toContainText("src");
+}
+
 async function expectDiffCodeFontSize(page: Page, fontSize: number): Promise<void> {
   await expect
     .poll(async () => {

packages/app/src/git/diff-flat-items.test.ts

@@ -22,6 +22,7 @@ describe("buildDiffFlatItems", () => {
   it("emits a body and a sticky index for each expanded file", () => {
     const { items, stickyHeaderIndices } = buildDiffFlatItems({
       files: [createFile("a.ts"), createFile("b.ts")],
+      viewMode: "tree",
       collapsedFolders: new Set(),
       expandedPaths: new Set(["a.ts"]),
     });
@@ -32,9 +33,23 @@ describe("buildDiffFlatItems", () => {
     expect(items[0].type).toBe("header");
   });
 
+  it("emits the old flat list without folder rows or indentation", () => {
+    const { items, stickyHeaderIndices } = buildDiffFlatItems({
+      files,
+      viewMode: "flat",
+      collapsedFolders: new Set(),
+      expandedPaths: new Set(["src/app/a.ts"]),
+    });
+
+    expect(summarize(items)).toEqual(["a.ts", "body:a.ts", "b.ts"]);
+    expect(stickyHeaderIndices).toEqual([0]);
+    expect(items.every((item) => item.type !== "folder")).toBe(true);
+  });
+
   it("groups files under compressed folder rows, all expanded by default", () => {
     const { items } = buildDiffFlatItems({
       files,
+      viewMode: "tree",
       collapsedFolders: new Set(),
       expandedPaths: new Set(),
     });
@@ -45,6 +60,7 @@ describe("buildDiffFlatItems", () => {
   it("collapsing a folder hides its descendants but keeps the row", () => {
     const { items } = buildDiffFlatItems({
       files,
+      viewMode: "tree",
       collapsedFolders: new Set(["src/app/nested"]),
       expandedPaths: new Set(),
     });
@@ -54,6 +70,7 @@ describe("buildDiffFlatItems", () => {
   it("collapsing an ancestor hides everything below it", () => {
     const { items } = buildDiffFlatItems({
       files,
+      viewMode: "tree",
       collapsedFolders: new Set(["src/app"]),
       expandedPaths: new Set(),
     });
@@ -65,6 +82,7 @@ describe("buildDiffFlatItems", () => {
     // header at index 3, with the body right after.
     const { items, stickyHeaderIndices } = buildDiffFlatItems({
       files,
+      viewMode: "tree",
       collapsedFolders: new Set(),
       expandedPaths: new Set(["src/app/a.ts"]),
     });
@@ -84,6 +102,7 @@ describe("buildDiffFlatItems", () => {
   it("maps tree file rows back to their original files array index", () => {
     const { items } = buildDiffFlatItems({
       files,
+      viewMode: "tree",
       collapsedFolders: new Set(),
       expandedPaths: new Set(),
     });
@@ -96,6 +115,7 @@ describe("buildDiffFlatItems", () => {
 describe("sumHeightsBefore", () => {
   const items = buildDiffFlatItems({
     files: [createFile("src/a.ts"), createFile("src/b.ts")],
+    viewMode: "tree",
     collapsedFolders: new Set(),
     expandedPaths: new Set(),
   }).items; // [folder, a.ts, b.ts]

packages/app/src/git/diff-flat-items.ts

@@ -30,6 +30,7 @@ export interface DiffFlatItemsResult {
 
 export interface BuildDiffFlatItemsInput {
   files: ParsedDiffFile[];
+  viewMode: "flat" | "tree";
   /** Full uncompressed directory paths that are collapsed (empty = all expanded). */
   collapsedFolders: ReadonlySet<string>;
   /** File paths whose diff body is expanded. */
@@ -52,6 +53,7 @@ export interface BuildDiffFlatItemsInput {
  */
 export function buildDiffFlatItems({
   files,
+  viewMode,
   collapsedFolders,
   expandedPaths,
   tree,
@@ -68,6 +70,13 @@ export function buildDiffFlatItems({
     }
   };
 
+  if (viewMode === "flat") {
+    for (const [fileIndex, file] of files.entries()) {
+      pushFile(file, fileIndex, 0);
+    }
+    return { items, stickyHeaderIndices };
+  }
+
   const indexByPath = new Map(files.map((file, index) => [file.path, index]));
   const compressedTree = tree ?? compressSingleChildChains(buildDiffTree(files));
   const rows = flattenDiffTree(compressedTree, collapsedFolders);

packages/app/src/git/diff-pane.tsx

@@ -39,6 +39,7 @@ import {
   FolderTree,
   GitCommitHorizontal,
   GitMerge,
+  List,
   ListChevronsDownUp,
   ListChevronsUpDown,
   Pilcrow,
@@ -1219,7 +1220,6 @@ type PressableStyleFn = (
   state: PressableStateCallbackType & { hovered?: boolean; open?: boolean },
 ) => StyleProp<ViewStyle>;
 
-const foregroundIconColorMapping = (theme: Theme) => ({ color: theme.colors.foreground });
 const foregroundMutedIconColorMapping = (theme: Theme) => ({ color: theme.colors.foregroundMuted });
 
 const ThemedActivityIndicator = withUnistyles(ActivityIndicator);
@@ -1230,6 +1230,7 @@ const ThemedWrapText = withUnistyles(WrapText);
 const ThemedListChevronsDownUp = withUnistyles(ListChevronsDownUp);
 const ThemedListChevronsUpDown = withUnistyles(ListChevronsUpDown);
 const ThemedFolderTree = withUnistyles(FolderTree);
+const ThemedList = withUnistyles(List);
 const ThemedGitCommitHorizontal = withUnistyles(GitCommitHorizontal);
 const ThemedDownload = withUnistyles(Download);
 const ThemedUpload = withUnistyles(Upload);
@@ -1240,101 +1241,89 @@ const ThemedRefreshCcw = withUnistyles(RefreshCcw);
 const ThemedArchive = withUnistyles(Archive);
 const ThemedChevronDown = withUnistyles(ChevronDown);
 
-interface DiffLayoutToggleGroupProps {
+const DIFF_OPTIONS_WHITESPACE_ICON = (
+  <ThemedPilcrow size={14} uniProps={foregroundMutedIconColorMapping} />
+);
+const DIFF_OPTIONS_WRAP_ICON = (
+  <ThemedWrapText size={14} uniProps={foregroundMutedIconColorMapping} />
+);
+
+interface DiffLayoutToggleProps {
   layout: "unified" | "split";
-  unifiedToggleStyle: PressableStyleFn;
-  splitToggleStyle: PressableStyleFn;
-  onUnified: () => void;
-  onSplit: () => void;
-}
-
-function DiffLayoutToggleGroup({
-  layout,
-  unifiedToggleStyle,
-  splitToggleStyle,
-  onUnified,
-  onSplit,
-}: DiffLayoutToggleGroupProps) {
-  const { t } = useTranslation();
-  const unifiedLabel = t("workspace.git.diff.unified");
-  const splitLabel = t("workspace.git.diff.split");
-  return (
-    <View style={styles.toggleButtonGroup}>
-      <Tooltip delayDuration={300}>
-        <TooltipTrigger asChild>
-          <Pressable
-            accessibilityRole="button"
-            accessibilityLabel={unifiedLabel}
-            testID="changes-layout-unified"
-            onPress={onUnified}
-            style={unifiedToggleStyle}
-          >
-            <ThemedAlignJustify
-              size={14}
-              uniProps={
-                layout === "unified" ? foregroundIconColorMapping : foregroundMutedIconColorMapping
-              }
-            />
-          </Pressable>
-        </TooltipTrigger>
-        <TooltipContent side="bottom">
-          <Text style={styles.tooltipText}>{unifiedLabel}</Text>
-        </TooltipContent>
-      </Tooltip>
-      <Tooltip delayDuration={300}>
-        <TooltipTrigger asChild>
-          <Pressable
-            accessibilityRole="button"
-            accessibilityLabel={splitLabel}
-            testID="changes-layout-split"
-            onPress={onSplit}
-            style={splitToggleStyle}
-          >
-            <ThemedColumns2
-              size={14}
-              uniProps={
-                layout === "split" ? foregroundIconColorMapping : foregroundMutedIconColorMapping
-              }
-            />
-          </Pressable>
-        </TooltipTrigger>
-        <TooltipContent side="bottom">
-          <Text style={styles.tooltipText}>{splitLabel}</Text>
-        </TooltipContent>
-      </Tooltip>
-    </View>
-  );
-}
-
-interface DiffWhitespaceToggleProps {
-  hideWhitespace: boolean;
   isMobile: boolean;
   toggleStyle: PressableStyleFn;
   onToggle: () => void;
 }
 
-function DiffWhitespaceToggle({
+function DiffLayoutToggle({ layout, isMobile, toggleStyle, onToggle }: DiffLayoutToggleProps) {
-  hideWhitespace,
-  isMobile,
-  toggleStyle,
-  onToggle,
-}: DiffWhitespaceToggleProps) {
   const { t } = useTranslation();
-  const label = t("workspace.git.diff.hideWhitespace");
+  const label =
+    layout === "unified"
+      ? t("workspace.git.diff.switchToSplit")
+      : t("workspace.git.diff.switchToUnified");
   return (
     <Tooltip delayDuration={300}>
       <TooltipTrigger asChild>
         <Pressable
           accessibilityRole="button"
           accessibilityLabel={label}
-          testID="changes-toggle-whitespace"
+          testID="changes-toggle-layout"
+          onPress={onToggle}
+          style={toggleStyle}
+        >
+          {layout === "unified" ? (
+            <ThemedColumns2 size={isMobile ? 18 : 14} uniProps={foregroundMutedIconColorMapping} />
+          ) : (
+            <ThemedAlignJustify
+              size={isMobile ? 18 : 14}
+              uniProps={foregroundMutedIconColorMapping}
+            />
+          )}
+        </Pressable>
+      </TooltipTrigger>
+      <TooltipContent side="bottom">
+        <Text style={styles.tooltipText}>{label}</Text>
+      </TooltipContent>
+    </Tooltip>
+  );
+}
+
+interface DiffViewModeToggleProps {
+  viewMode: "flat" | "tree";
+  isMobile: boolean;
+  toggleStyle: PressableStyleFn;
+  onToggle: () => void;
+}
+
+function DiffViewModeToggle({
+  viewMode,
+  isMobile,
+  toggleStyle,
+  onToggle,
+}: DiffViewModeToggleProps) {
+  const { t } = useTranslation();
+  const label =
+    viewMode === "flat"
+      ? t("workspace.git.diff.showTreeView")
+      : t("workspace.git.diff.showFlatView");
+  return (
+    <Tooltip delayDuration={300}>
+      <TooltipTrigger asChild>
+        <Pressable
+          accessibilityRole="button"
+          accessibilityLabel={label}
+          testID="changes-toggle-view-mode"
           style={toggleStyle}
           onPress={onToggle}
         >
-          <ThemedPilcrow
+          {viewMode === "flat" ? (
-            size={isMobile ? 18 : 14}
+            <ThemedFolderTree
-            uniProps={hideWhitespace ? foregroundIconColorMapping : foregroundMutedIconColorMapping}
+              size={isMobile ? 18 : 14}
-          />
+              uniProps={foregroundMutedIconColorMapping}
+            />
+          ) : (
+            <ThemedList size={isMobile ? 18 : 14} uniProps={foregroundMutedIconColorMapping} />
+          )}
         </Pressable>
       </TooltipTrigger>
       <TooltipContent side="bottom">
@@ -1345,82 +1334,24 @@ function DiffWhitespaceToggle({
 }
 
 interface DiffFilesToolbarProps {
-  wrapLines: boolean;
-  // Controls file-DIFF bodies only (not folders). Named explicitly so the
-  // folder control below stays unambiguous (Codex item 4).
   allFileDiffsExpanded: boolean;
-  showFolderControl: boolean;
-  allFoldersCollapsed: boolean;
   isMobile: boolean;
-  wrapLinesToggleStyle: PressableStyleFn;
   expandAllToggleStyle: PressableStyleFn;
-  folderToggleStyle: PressableStyleFn;
-  onToggleWrapLines: () => void;
   onToggleExpandAll: () => void;
-  onToggleCollapseAllFolders: () => void;
 }
 
 function DiffFilesToolbar({
-  wrapLines,
   allFileDiffsExpanded,
-  showFolderControl,
-  allFoldersCollapsed,
   isMobile,
-  wrapLinesToggleStyle,
   expandAllToggleStyle,
-  folderToggleStyle,
-  onToggleWrapLines,
   onToggleExpandAll,
-  onToggleCollapseAllFolders,
 }: DiffFilesToolbarProps) {
   const { t } = useTranslation();
-  const wrapLinesLabel = wrapLines
-    ? t("workspace.git.diff.scrollLongLines")
-    : t("workspace.git.diff.wrapLongLines");
   const expandAllLabel = allFileDiffsExpanded
     ? t("workspace.git.diff.collapseAll")
     : t("workspace.git.diff.expandAll");
-  const folderLabel = allFoldersCollapsed
-    ? t("workspace.git.diff.expandAllFolders")
-    : t("workspace.git.diff.collapseAllFolders");
   return (
     <View style={styles.diffStatusButtons}>
-      {showFolderControl ? (
-        <Tooltip delayDuration={300}>
-          <TooltipTrigger asChild>
-            <Pressable
-              accessibilityRole="button"
-              accessibilityLabel={folderLabel}
-              testID="changes-toggle-folders"
-              style={folderToggleStyle}
-              onPress={onToggleCollapseAllFolders}
-            >
-              <ThemedFolderTree
-                size={isMobile ? 18 : 14}
-                uniProps={
-                  allFoldersCollapsed ? foregroundIconColorMapping : foregroundMutedIconColorMapping
-                }
-              />
-            </Pressable>
-          </TooltipTrigger>
-          <TooltipContent side="bottom">
-            <Text style={styles.tooltipText}>{folderLabel}</Text>
-          </TooltipContent>
-        </Tooltip>
-      ) : null}
-      <Tooltip delayDuration={300}>
-        <TooltipTrigger asChild>
-          <Pressable style={wrapLinesToggleStyle} onPress={onToggleWrapLines}>
-            <ThemedWrapText
-              size={isMobile ? 18 : 14}
-              uniProps={wrapLines ? foregroundIconColorMapping : foregroundMutedIconColorMapping}
-            />
-          </Pressable>
-        </TooltipTrigger>
-        <TooltipContent side="bottom">
-          <Text style={styles.tooltipText}>{wrapLinesLabel}</Text>
-        </TooltipContent>
-      </Tooltip>
       <Tooltip delayDuration={300}>
         <TooltipTrigger asChild>
           <Pressable
@@ -1450,50 +1381,105 @@ function DiffFilesToolbar({
   );
 }
 
-interface DiffRefreshButtonProps {
+interface DiffOptionsMenuProps {
+  hideWhitespace: boolean;
+  isMobile: boolean;
   isRefreshing: boolean;
-  toggleStyle: PressableStyleFn;
+  overflowToggleStyle: PressableStyleFn;
-  onPress: () => void;
+  refreshSupported: boolean;
+  wrapLines: boolean;
+  onRefresh: () => void;
+  onToggleHideWhitespace: () => void;
+  onToggleWrapLines: () => void;
+}
+
+function DiffOptionsMenu({
+  hideWhitespace,
+  isMobile,
+  isRefreshing,
+  overflowToggleStyle,
+  refreshSupported,
+  wrapLines,
+  onRefresh,
+  onToggleHideWhitespace,
+  onToggleWrapLines,
+}: DiffOptionsMenuProps) {
+  const { t } = useTranslation();
+  const whitespaceLabel = hideWhitespace
+    ? t("workspace.git.diff.showWhitespace")
+    : t("workspace.git.diff.hideWhitespace");
+  const wrapLinesLabel = wrapLines
+    ? t("workspace.git.diff.scrollLongLines")
+    : t("workspace.git.diff.wrapLongLines");
+  const optionsLabel = t("workspace.git.diff.options");
+  const refreshIcon = useMemo(
+    () =>
+      isRefreshing ? (
+        <ThemedLoadingSpinner size={ICON_SIZE.sm} uniProps={foregroundMutedIconColorMapping} />
+      ) : (
+        <ThemedRotateCw size={ICON_SIZE.sm} uniProps={foregroundMutedIconColorMapping} />
+      ),
+    [isRefreshing],
+  );
+
+  return (
+    <DropdownMenu>
+      <Tooltip delayDuration={300}>
+        <TooltipTrigger asChild>
+          <DropdownMenuTrigger
+            accessibilityRole="button"
+            accessibilityLabel={optionsLabel}
+            testID="changes-options-menu"
+            style={overflowToggleStyle}
+          >
+            <ThemedChevronDown
+              size={isMobile ? 18 : 14}
+              uniProps={foregroundMutedIconColorMapping}
+            />
+          </DropdownMenuTrigger>
+        </TooltipTrigger>
+        <TooltipContent side="bottom">
+          <Text style={styles.tooltipText}>{optionsLabel}</Text>
+        </TooltipContent>
+      </Tooltip>
+      <DropdownMenuContent align="end" width={240} testID="changes-options-menu-content">
+        <DropdownMenuItem
+          leading={DIFF_OPTIONS_WHITESPACE_ICON}
+          selected={hideWhitespace}
+          testID="changes-toggle-whitespace"
+          onSelect={onToggleHideWhitespace}
+        >
+          {whitespaceLabel}
+        </DropdownMenuItem>
+        <DropdownMenuItem
+          leading={DIFF_OPTIONS_WRAP_ICON}
+          selected={wrapLines}
+          testID="changes-toggle-wrap-lines"
+          onSelect={onToggleWrapLines}
+        >
+          {wrapLinesLabel}
+        </DropdownMenuItem>
+        {refreshSupported ? (
+          <>
+            <DropdownMenuSeparator />
+            <DropdownMenuItem
+              leading={refreshIcon}
+              disabled={isRefreshing}
+              testID="changes-refresh"
+              onSelect={onRefresh}
+            >
+              {isRefreshing ? t("workspace.git.diff.refreshing") : t("workspace.git.diff.refresh")}
+            </DropdownMenuItem>
+          </>
+        ) : null}
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
 }
 
 const ThemedRotateCw = withUnistyles(RotateCw);
 const ThemedLoadingSpinner = withUnistyles(LoadingSpinner);
 
-function DiffRefreshButton({ isRefreshing, toggleStyle, onPress }: DiffRefreshButtonProps) {
-  const { t } = useTranslation();
-  const refreshLabel = t("workspace.git.diff.refresh");
-  return (
-    <Tooltip delayDuration={300}>
-      <TooltipTrigger asChild>
-        <Pressable
-          accessibilityRole="button"
-          accessibilityLabel={
-            isRefreshing ? t("workspace.git.diff.refreshing") : t("workspace.git.diff.refreshState")
-          }
-          testID="changes-refresh"
-          style={toggleStyle}
-          onPress={onPress}
-          disabled={isRefreshing}
-        >
-          <View style={styles.refreshIcon}>
-            {isRefreshing ? (
-              <ThemedLoadingSpinner
-                size={ICON_SIZE.sm}
-                uniProps={foregroundMutedIconColorMapping}
-              />
-            ) : (
-              <ThemedRotateCw size={ICON_SIZE.sm} uniProps={foregroundMutedIconColorMapping} />
-            )}
-          </View>
-        </Pressable>
-      </TooltipTrigger>
-      <TooltipContent side="bottom">
-        <Text style={styles.tooltipText}>{refreshLabel}</Text>
-      </TooltipContent>
-    </Tooltip>
-  );
-}
-
 type DiffFlatItemLayoutGetter = NonNullable<FlatListProps<DiffFlatItem>["getItemLayout"]>;
 
 function getUnifiedDiffLineCount(file: ParsedDiffFile): number {
@@ -1756,30 +1742,22 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
   const { preferences: changesPreferences, updatePreferences: updateChangesPreferences } =
     useChangesPreferences();
   const wrapLines = changesPreferences.wrapLines;
+  const viewMode = changesPreferences.viewMode;
   const effectiveLayout = canUseSplitLayout ? changesPreferences.layout : "unified";
 
   const handleToggleWrapLines = useCallback(() => {
     void updateChangesPreferences({ wrapLines: !wrapLines });
   }, [updateChangesPreferences, wrapLines]);
 
-  const handleLayoutChange = useCallback(
-    (nextLayout: "unified" | "split") => {
-      void updateChangesPreferences({ layout: nextLayout });
-    },
-    [updateChangesPreferences],
-  );
-
   const handleToggleHideWhitespace = useCallback(() => {
     void updateChangesPreferences({ hideWhitespace: !changesPreferences.hideWhitespace });
   }, [changesPreferences.hideWhitespace, updateChangesPreferences]);
 
-  const handleLayoutUnified = useCallback(() => {
+  const handleToggleLayout = useCallback(() => {
-    handleLayoutChange("unified");
+    void updateChangesPreferences({
-  }, [handleLayoutChange]);
+      layout: changesPreferences.layout === "unified" ? "split" : "unified",
-
+    });
-  const handleLayoutSplit = useCallback(() => {
+  }, [changesPreferences.layout, updateChangesPreferences]);
-    handleLayoutChange("split");
-  }, [handleLayoutChange]);
 
   const codeFontSize = appSettings.codeFontSize;
   const diffBodyLineHeight = Math.round(codeFontSize * 1.5);
@@ -1796,39 +1774,19 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
   }, [appSettings.monoFontFamily, codeFontSize, diffBodyLineHeight]);
   const diffModeTriggerStyle = useMemo(() => buildDiffModeTriggerStyle(), []);
 
-  const unifiedToggleStyle = useMemo(
+  const layoutToggleStyle = useMemo(
-    () =>
+    () => buildToggleButtonStyle(false, styles.expandAllButton),
-      buildToggleButtonStyle(changesPreferences.layout === "unified", [
+    [],
-        styles.toggleButton,
-        styles.toggleButtonGroupStart,
-      ]),
-    [changesPreferences.layout],
   );
 
-  const splitToggleStyle = useMemo(
+  const viewModeToggleStyle = useMemo(
-    () =>
+    () => buildToggleButtonStyle(viewMode === "tree", styles.expandAllButton),
-      buildToggleButtonStyle(changesPreferences.layout === "split", [
+    [viewMode],
-        styles.toggleButton,
-        styles.toggleButtonGroupEnd,
-      ]),
-    [changesPreferences.layout],
-  );
-
-  const hideWhitespaceToggleStyle = useMemo(
-    () => buildToggleButtonStyle(changesPreferences.hideWhitespace, styles.expandAllButton),
-    [changesPreferences.hideWhitespace],
-  );
-
-  const wrapLinesToggleStyle = useMemo(
-    () => buildToggleButtonStyle(wrapLines, styles.expandAllButton),
-    [wrapLines],
   );
 
   const expandAllToggleStyle = useMemo(() => buildExpandAllButtonStyle(), []);
 
-  const folderToggleStyle = useMemo(() => buildExpandAllButtonStyle(), []);
+  const overflowToggleStyle = useMemo(() => buildExpandAllButtonStyle(), []);
-
-  const refreshToggleStyle = useMemo(() => buildExpandAllButtonStyle(), []);
 
   const toast = useToast();
   const refreshSupported = useSessionStore(
@@ -1995,6 +1953,16 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
     [collapsedFoldersArray, allFolderPathSet],
   );
   const diffListRef = useRef<FlatList<DiffFlatItem>>(null);
+  const handleToggleViewMode = useCallback(() => {
+    const nextViewMode = viewMode === "flat" ? "tree" : "flat";
+    if (nextViewMode === "tree") {
+      diffListRef.current?.scrollToOffset({ offset: 0, animated: false });
+      if (workspaceStateKey) {
+        setDiffCollapsedFoldersForWorkspace(workspaceStateKey, []);
+      }
+    }
+    void updateChangesPreferences({ viewMode: nextViewMode });
+  }, [setDiffCollapsedFoldersForWorkspace, updateChangesPreferences, viewMode, workspaceStateKey]);
   const scrollbar = useWebScrollViewScrollbar(diffListRef, {
     enabled: showDesktopWebScrollbar,
   });
@@ -2012,12 +1980,13 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
   const { flatItems, stickyHeaderIndices } = useMemo(() => {
     const { items, stickyHeaderIndices: stickyIndices } = buildDiffFlatItems({
       files,
+      viewMode,
       tree: compressedTree,
       collapsedFolders,
       expandedPaths,
     });
     return { flatItems: items, stickyHeaderIndices: stickyIndices };
-  }, [compressedTree, collapsedFolders, expandedPaths, files]);
+  }, [compressedTree, collapsedFolders, expandedPaths, files, viewMode]);
 
   const getBodyHeightKey = useCallback(
     (file: ParsedDiffFile): string => {
@@ -2248,25 +2217,6 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
     }
   }, [allFileDiffsExpanded, files, setDiffExpandedPathsForWorkspace, workspaceStateKey]);
 
-  // Membership, not count: collapsedFolders is already filtered to present folders, so
-  // "all collapsed" means every present folder path is in it.
-  const allFoldersCollapsed =
-    allFolderPaths.length > 0 && allFolderPaths.every((path) => collapsedFolders.has(path));
-
-  const handleToggleCollapseAllFolders = useCallback(() => {
-    if (!workspaceStateKey) {
-      return;
-    }
-    // Anchor to the top before collapsing everything so the viewport isn't stranded.
-    if (!allFoldersCollapsed) {
-      diffListRef.current?.scrollToOffset({ offset: 0, animated: false });
-    }
-    setDiffCollapsedFoldersForWorkspace(
-      workspaceStateKey,
-      allFoldersCollapsed ? [] : allFolderPaths,
-    );
-  }, [allFolderPaths, allFoldersCollapsed, setDiffCollapsedFoldersForWorkspace, workspaceStateKey]);
-
   const renderFlatItem = useCallback(
     ({ item }: { item: DiffFlatItem }) => {
       if (item.type === "folder") {
@@ -2290,7 +2240,7 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
             file={item.file}
             isExpanded={item.isExpanded}
             depth={item.depth}
-            showDir={false}
+            showDir={viewMode === "flat"}
             onToggle={handleToggleExpanded}
             onHeaderHeightChange={handleHeaderHeightChange}
             testID={`diff-file-${item.fileIndex}`}
@@ -2320,6 +2270,7 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
       handleToggleExpanded,
       handleToggleFolder,
       reviewActions,
+      viewMode,
       wrapLines,
     ],
   );
@@ -2347,6 +2298,7 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
       effectiveLayout,
       diffBodyTypographyKey,
       heightVersion,
+      viewMode,
       wrapLines,
       reviewActions,
     }),
@@ -2356,6 +2308,7 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
       effectiveLayout,
       diffBodyTypographyKey,
       heightVersion,
+      viewMode,
       wrapLines,
       reviewActions,
     ],
@@ -2485,42 +2438,40 @@ export function GitDiffPane({ serverId, workspaceId, cwd, enabled }: GitDiffPane
             </DropdownMenu>
             <View style={styles.diffStatusButtons}>
               {canUseSplitLayout ? (
-                <DiffLayoutToggleGroup
+                <DiffLayoutToggle
                   layout={changesPreferences.layout}
-                  unifiedToggleStyle={unifiedToggleStyle}
+                  isMobile={isMobile}
-                  splitToggleStyle={splitToggleStyle}
+                  toggleStyle={layoutToggleStyle}
-                  onUnified={handleLayoutUnified}
+                  onToggle={handleToggleLayout}
-                  onSplit={handleLayoutSplit}
+                />
+              ) : null}
+              {files.length > 0 ? (
+                <DiffViewModeToggle
+                  viewMode={viewMode}
+                  isMobile={isMobile}
+                  toggleStyle={viewModeToggleStyle}
+                  onToggle={handleToggleViewMode}
                 />
               ) : null}
-              <DiffWhitespaceToggle
-                hideWhitespace={changesPreferences.hideWhitespace}
-                isMobile={isMobile}
-                toggleStyle={hideWhitespaceToggleStyle}
-                onToggle={handleToggleHideWhitespace}
-              />
               {files.length > 0 ? (
                 <DiffFilesToolbar
-                  wrapLines={wrapLines}
                   allFileDiffsExpanded={allFileDiffsExpanded}
-                  showFolderControl={allFolderPaths.length > 0}
-                  allFoldersCollapsed={allFoldersCollapsed}
                   isMobile={isMobile}
-                  wrapLinesToggleStyle={wrapLinesToggleStyle}
                   expandAllToggleStyle={expandAllToggleStyle}
-                  folderToggleStyle={folderToggleStyle}
-                  onToggleWrapLines={handleToggleWrapLines}
                   onToggleExpandAll={handleToggleExpandAll}
-                  onToggleCollapseAllFolders={handleToggleCollapseAllFolders}
-                />
-              ) : null}
-              {refreshSupported ? (
-                <DiffRefreshButton
-                  isRefreshing={isRefreshing}
-                  toggleStyle={refreshToggleStyle}
-                  onPress={handleRefresh}
                 />
               ) : null}
+              <DiffOptionsMenu
+                hideWhitespace={changesPreferences.hideWhitespace}
+                isMobile={isMobile}
+                isRefreshing={isRefreshing}
+                overflowToggleStyle={overflowToggleStyle}
+                refreshSupported={refreshSupported}
+                wrapLines={wrapLines}
+                onRefresh={handleRefresh}
+                onToggleHideWhitespace={handleToggleHideWhitespace}
+                onToggleWrapLines={handleToggleWrapLines}
+              />
             </View>
           </View>
         </View>
@@ -2602,46 +2553,9 @@ const styles = StyleSheet.create((theme) => ({
     gap: theme.spacing[1],
     flexWrap: "wrap",
   },
-  toggleButtonGroup: {
-    flexDirection: "row",
-    alignItems: "center",
-  },
-  toggleButton: {
-    alignItems: "center",
-    justifyContent: "center",
-    minWidth: {
-      xs: 32,
-      sm: 32,
-      md: 24,
-    },
-    height: {
-      xs: 32,
-      sm: 32,
-      md: 24,
-    },
-    paddingHorizontal: {
-      xs: theme.spacing[2],
-      sm: theme.spacing[2],
-      md: theme.spacing[1],
-    },
-  },
-  toggleButtonGroupStart: {
-    borderTopLeftRadius: theme.borderRadius.base,
-    borderBottomLeftRadius: theme.borderRadius.base,
-  },
-  toggleButtonGroupEnd: {
-    borderTopRightRadius: theme.borderRadius.base,
-    borderBottomRightRadius: theme.borderRadius.base,
-  },
   toggleButtonSelected: {
     backgroundColor: theme.colors.surface2,
   },
-  refreshIcon: {
-    width: ICON_SIZE.md,
-    height: ICON_SIZE.md,
-    alignItems: "center",
-    justifyContent: "center",
-  },
   expandAllButton: {
     flexDirection: "row",
     alignItems: "center",

packages/app/src/hooks/use-changes-preferences/storage.test.ts

@@ -28,6 +28,7 @@ describe("loadChangesPreferencesFromStorage", () => {
 
     expect(result).toEqual({
       layout: "unified",
+      viewMode: "flat",
       wrapLines: true,
       hideWhitespace: false,
     });
@@ -37,6 +38,7 @@ describe("loadChangesPreferencesFromStorage", () => {
   it("loads persisted layout and whitespace preferences without rewriting storage", async () => {
     const persisted = JSON.stringify({
       layout: "split",
+      viewMode: "tree",
       hideWhitespace: true,
       wrapLines: false,
     });
@@ -48,6 +50,7 @@ describe("loadChangesPreferencesFromStorage", () => {
 
     expect(result).toEqual({
       layout: "split",
+      viewMode: "tree",
       hideWhitespace: true,
       wrapLines: false,
     });
@@ -64,11 +67,16 @@ describe("saveChangesPreferences", () => {
 
     await saveChangesPreferences({
       queryClient,
-      updates: { layout: "split", hideWhitespace: true },
+      updates: { layout: "split", viewMode: "tree", hideWhitespace: true },
       storage,
     });
 
-    const expected = { ...DEFAULT_CHANGES_PREFERENCES, layout: "split", hideWhitespace: true };
+    const expected = {
+      ...DEFAULT_CHANGES_PREFERENCES,
+      layout: "split",
+      viewMode: "tree",
+      hideWhitespace: true,
+    };
     expect(queryClient.getQueryData(CHANGES_PREFERENCES_QUERY_KEY)).toEqual(expected);
     expect(storage.entries.get(CHANGES_PREFERENCES_STORAGE_KEY)).toBe(JSON.stringify(expected));
   });

packages/app/src/hooks/use-changes-preferences/storage.ts

@@ -7,18 +7,21 @@ export const CHANGES_PREFERENCES_QUERY_KEY = ["changes-preferences"];
 
 const changesPreferencesSchema = z.object({
   layout: z.enum(["unified", "split"]).optional(),
+  viewMode: z.enum(["flat", "tree"]).optional(),
   wrapLines: z.boolean().optional(),
   hideWhitespace: z.boolean().optional(),
 });
 
 export interface ChangesPreferences {
   layout: "unified" | "split";
+  viewMode: "flat" | "tree";
   wrapLines: boolean;
   hideWhitespace: boolean;
 }
 
 export const DEFAULT_CHANGES_PREFERENCES: ChangesPreferences = {
   layout: "unified",
+  viewMode: "flat",
   wrapLines: false,
   hideWhitespace: false,
 };

packages/app/src/i18n/resources/ar.ts

@@ -707,7 +707,13 @@ export const ar: TranslationResources = {
         tooLarge: "الفرق كبير جدًا بحيث لا يمكن عرضه",
         unified: "الفرق الموحدة",
         split: "فرق جنبًا إلى جنب",
+        switchToUnified: "التبديل إلى الفرق الموحد",
+        switchToSplit: "التبديل إلى الفرق جنبًا إلى جنب",
+        showTreeView: "إظهار شجرة المجلدات",
+        showFlatView: "إظهار قائمة الملفات المسطحة",
+        options: "خيارات الفرق",
         hideWhitespace: "إخفاء المسافة البيضاء",
+        showWhitespace: "إظهار المسافة البيضاء",
         scrollLongLines: "قم بتمرير الخطوط الطويلة",
         wrapLongLines: "لف الخطوط الطويلة",
         collapseAll: "طي كافة الملفات",

packages/app/src/i18n/resources/en.ts

@@ -714,7 +714,13 @@ export const en = {
         tooLarge: "Diff too large to display",
         unified: "Unified diff",
         split: "Side-by-side diff",
+        switchToUnified: "Switch to unified diff",
+        switchToSplit: "Switch to side-by-side diff",
+        showTreeView: "Show folder tree",
+        showFlatView: "Show flat file list",
+        options: "Diff options",
         hideWhitespace: "Hide whitespace",
+        showWhitespace: "Show whitespace",
         scrollLongLines: "Scroll long lines",
         wrapLongLines: "Wrap long lines",
         collapseAll: "Collapse all files",

packages/app/src/i18n/resources/es.ts

@@ -734,7 +734,13 @@ export const es: TranslationResources = {
         tooLarge: "La diferencia es demasiado grande para mostrarse",
         unified: "Diferencia unificada",
         split: "Diferencia de lado a lado",
+        switchToUnified: "Cambiar a diferencia unificada",
+        switchToSplit: "Cambiar a diferencia lado a lado",
+        showTreeView: "Mostrar árbol de carpetas",
+        showFlatView: "Mostrar lista plana de archivos",
+        options: "Opciones de diferencia",
         hideWhitespace: "Ocultar espacios en blanco",
+        showWhitespace: "Mostrar espacios en blanco",
         scrollLongLines: "Desplazarse por largas filas",
         wrapLongLines: "Envolver largas filas",
         collapseAll: "Contraer todos los archivos",

packages/app/src/i18n/resources/fr.ts

@@ -733,7 +733,13 @@ export const fr: TranslationResources = {
         tooLarge: "Diff trop grand pour être affiché",
         unified: "Différentiel unifié",
         split: "Différent côte à côte",
+        switchToUnified: "Passer au diff unifié",
+        switchToSplit: "Passer au diff côte à côte",
+        showTreeView: "Afficher l'arborescence des dossiers",
+        showFlatView: "Afficher la liste de fichiers à plat",
+        options: "Options du diff",
         hideWhitespace: "Masquer les espaces",
+        showWhitespace: "Afficher les espaces",
         scrollLongLines: "Faire défiler les longues lignes",
         wrapLongLines: "Enroulez les longues lignes",
         collapseAll: "Réduire tous les fichiers",

packages/app/src/i18n/resources/ja.ts

@@ -719,7 +719,13 @@ export const ja: TranslationResources = {
         tooLarge: "差分が大きすぎて表示できません",
         unified: "ユニファイド差分",
         split: "左右比較",
+        switchToUnified: "ユニファイド差分に切り替え",
+        switchToSplit: "左右比較差分に切り替え",
+        showTreeView: "フォルダツリーを表示",
+        showFlatView: "フラットなファイル一覧を表示",
+        options: "差分オプション",
         hideWhitespace: "空白を非表示",
+        showWhitespace: "空白を表示",
         scrollLongLines: "長い行をスクロール",
         wrapLongLines: "長い行を折り返す",
         collapseAll: "すべて折りたたむ",

packages/app/src/i18n/resources/pt-BR.ts

@@ -725,7 +725,13 @@ export const ptBR: TranslationResources = {
         tooLarge: "Diff grande demais para exibir",
         unified: "Diff unificado",
         split: "Diff lado a lado",
+        switchToUnified: "Alternar para diff unificado",
+        switchToSplit: "Alternar para diff lado a lado",
+        showTreeView: "Mostrar árvore de pastas",
+        showFlatView: "Mostrar lista plana de arquivos",
+        options: "Opções do diff",
         hideWhitespace: "Ocultar espaços em branco",
+        showWhitespace: "Mostrar espaços em branco",
         scrollLongLines: "Rolar linhas longas",
         wrapLongLines: "Quebrar linhas longas",
         collapseAll: "Recolher todos os arquivos",

packages/app/src/i18n/resources/ru.ts

@@ -726,7 +726,13 @@ export const ru: TranslationResources = {
         tooLarge: "Разница слишком велика для отображения",
         unified: "Единый дифференциал",
         split: "Параллельная разница",
+        switchToUnified: "Переключить на объединенный diff",
+        switchToSplit: "Переключить на diff рядом",
+        showTreeView: "Показать дерево папок",
+        showFlatView: "Показать плоский список файлов",
+        options: "Параметры diff",
         hideWhitespace: "Скрыть пробелы",
+        showWhitespace: "Показать пробелы",
         scrollLongLines: "Прокручивать длинные строки",
         wrapLongLines: "Перенос длинных строк",
         collapseAll: "Свернуть все файлы",

packages/app/src/i18n/resources/zh-CN.ts

@@ -701,7 +701,13 @@ export const zhCN: TranslationResources = {
         tooLarge: "Diff 过大，无法显示",
         unified: "Unified diff",
         split: "Side-by-side diff",
+        switchToUnified: "切换到统一差异视图",
+        switchToSplit: "切换到并排差异视图",
+        showTreeView: "显示文件夹树",
+        showFlatView: "显示平铺文件列表",
+        options: "Diff 选项",
         hideWhitespace: "隐藏空白差异",
+        showWhitespace: "显示空白差异",
         scrollLongLines: "滚动长行",
         wrapLongLines: "自动换行长行",
         collapseAll: "折叠所有文件",