Keep compact file explorer visible while open (#1661)

* fix(app): keep compact explorer mounted while open

* fix(app): share compact explorer host state

* fix(app): refresh diff row metrics after font changes

packages/app/src/components/compact-explorer-sidebar-host-state.ts

@@ -0,0 +1,59 @@
+import { buildWorkspaceTabPersistenceKey } from "@/stores/workspace-layout-store";
+import type { ActiveWorkspaceSelection } from "@/stores/navigation-active-workspace-store";
+import type { WorkspaceDescriptor } from "@/stores/session-store";
+
+export interface CompactExplorerSidebarHostModel {
+  serverId: string;
+  workspaceId: string;
+  persistenceKey: string;
+  workspaceRoot: string;
+  isGit: boolean;
+}
+
+interface ResolveCompactExplorerSidebarHostModelInput {
+  previous: CompactExplorerSidebarHostModel | null;
+  selection: ActiveWorkspaceSelection | null;
+  workspace: WorkspaceDescriptor | null;
+  isGit: boolean;
+}
+
+function trimNonEmpty(value: string | null | undefined): string | null {
+  if (typeof value !== "string") {
+    return null;
+  }
+  const trimmed = value.trim();
+  return trimmed.length > 0 ? trimmed : null;
+}
+
+export function resolveCompactExplorerSidebarHostModel(
+  input: ResolveCompactExplorerSidebarHostModelInput,
+): CompactExplorerSidebarHostModel | null {
+  const serverId = trimNonEmpty(input.selection?.serverId);
+  const workspaceId = trimNonEmpty(input.selection?.workspaceId);
+  if (!serverId || !workspaceId) {
+    return null;
+  }
+
+  const persistenceKey = buildWorkspaceTabPersistenceKey({ serverId, workspaceId });
+  if (!persistenceKey) {
+    return null;
+  }
+
+  const previousForSelection =
+    input.previous &&
+    input.previous.serverId === serverId &&
+    input.previous.workspaceId === workspaceId
+      ? input.previous
+      : null;
+
+  return {
+    serverId,
+    workspaceId,
+    persistenceKey,
+    workspaceRoot:
+      trimNonEmpty(input.workspace?.workspaceDirectory) ??
+      previousForSelection?.workspaceRoot ??
+      "",
+    isGit: input.workspace ? input.isGit : (previousForSelection?.isGit ?? input.isGit),
+  };
+}