Git commit history (#1534)

* feat(app): add fileView preference for changes panel

* feat(app): add buildDiffTree util for changed-files tree

* feat(app): add changed-files tree directory row

* feat(app): changed-files tree view mode in changes panel (#117)

* feat(protocol): add checkout.commits.list RPC + commitsList feature flag

* feat(server): list branch commits ahead of base with on-remote flags

* feat(server): handle checkout.commits.list RPC and advertise capability

* feat(client): checkout.commits.list method + useCommitsQuery hook

* feat(app): per-commit inline view with local-vs-remote markers (#117)

* feat(protocol,server): per-commit file diff RPC (checkout.commits.file_diff)

* feat(app): open per-commit file diff on click (#117)

* refactor: surface baseRef + commits loading/error, drop dead depth field

* fix(app): flip commit local/remote dot — local hollow, remote filled

* feat(app): list/tree view for expanded commit file list (#117)

* fix(app): syntax-highlight per-commit file diff to match Changes view

* feat(app): draggable resize between commits and diff sections

* refactor(app): dedupe wrap-text helpers into diff-highlighted-text

* fix(app): clean up commits resize drag on unmount + a11y label

* fix(app): collapse commits section by default

* fix(app): render per-commit file diff with the shared Changes line renderer

* perf(app): memoize shared diff line row; drop redundant DiffLineView wrapper

* refactor(app): extract shared DiffFileBody; render commit file diff through it

* fix(app): hide inline-comment affordance in per-commit diffs (no reviewActions)

* feat(app): move commits to a resizable bottom drawer in the Changes panel

* feat(review): commitSha scoping for per-commit review drafts + attachment

* feat(app): per-commit inline comments wired through to the composer (#117)

* refactor(app): own commit file-diff open state in CommitFileList (drop reset effect)

* refactor(app): colocate diff-render cluster under git/diff-file-body/

* feat(app): add diff tab target kind (working/commit diff tabs)

* feat(app): useDiffFiles hook unifying working + commit diff targets

* feat(app): diff tab panel rendering working/commit diffs

* feat(app): open a commit diff tab on commit click; drop per-commit drawer/file list

* feat(app): open/scroll working diff tab on changed-file click

* fix(app): keep commit diff tabs ephemeral; align working diff whitespace

* feat(app): collapsible file sections in the diff tab, collapsed by default

* feat(app): make the on-remote commit dot more subtle

Dims the filled green remote dot (row + legend) to ~0.55 opacity so the
local-only ring stays the state that draws the eye.

* Reshape commit diffs around the existing Changes view

* Fix diff tab migration complexity after rebase

* Address diff tab review findings

* Clean up diff tab review interfaces

* Collapse commit diffs into the existing view

* Load commits when expanded

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/stores/workspace-layout-actions.ts

@@ -971,6 +971,52 @@ export function collectAllPanes(root: SplitNode): SplitPane[] {
   return internalRoot.group.children.flatMap((child) => collectAllPanes(child));
 }
 
+function isEphemeralTab(tab: WorkspaceTab): boolean {
+  // Commit diff tabs are ephemeral: their SHA may be rebased away before the next
+  // load, so a restored tab could point at a dead commit.
+  return tab.target.kind === "commit_diff";
+}
+
+function stripEphemeralTabsFromNode(node: SplitNodeInternal): SplitNodeInternal {
+  if (node.kind === "pane") {
+    const nextTabs = node.pane.tabs.filter((tab) => !isEphemeralTab(tab));
+    if (nextTabs.length === node.pane.tabs.length) {
+      return node;
+    }
+    // createPaneNode repoints focusedTabId to a surviving tab (or null) when the
+    // previously focused tab was an ephemeral one that we just removed.
+    return createPaneNode({
+      id: node.pane.id,
+      tabs: nextTabs,
+      focusedTabId: node.pane.focusedTabId,
+    });
+  }
+  return createGroupNode({
+    id: node.group.id,
+    direction: node.group.direction,
+    children: node.group.children.map((child) => stripEphemeralTabsFromNode(child)),
+    sizes: node.group.sizes,
+  });
+}
+
+/**
+ * Returns a copy of `layout` with every ephemeral tab (commit diff tabs) removed
+ * from each pane. Applied in the layout store's `partialize` so commit diff tabs
+ * are never written to storage — they're dropped on the next reload rather than
+ * restored pointing at a possibly-rebased SHA. Working diff tabs and all other
+ * tab kinds are left intact. Panes (and their ids/structure) are preserved even
+ * when emptied; the parent-tab map is renormalized against the surviving tabs.
+ */
+export function stripEphemeralTabsFromLayout(layout: WorkspaceLayout): WorkspaceLayout {
+  const internalLayout = asInternalLayout(layout);
+  const nextRoot = stripEphemeralTabsFromNode(internalLayout.root);
+  return withNormalizedParentTabMap({
+    root: nextRoot,
+    focusedPaneId: internalLayout.focusedPaneId,
+    parentTabIdByTabId: layout.parentTabIdByTabId,
+  });
+}
+
 export function getFocusedBrowserId(layout: WorkspaceLayout | null | undefined): string | null {
   if (!layout) {
     return null;