fix(vcs): Show History on a submodule folder shows the submodule's history (#1312)

Show History picked its repository with repoOf, which routes a nested repository's own root to the enclosing repository (right for the commit view's submodule pointer), so a submodule folder listed its gitlink history in the parent repository. A repository's own root now opens that repository's history, as in IDEA; other paths still use the innermost repository.

src/features/vcs/__tests__/multiRoot.test.ts

@@ -132,6 +132,14 @@ describe("multi-root Git log", () => {
     off();
   });
 
+  it("shows a submodule folder's own history, not the folder's history in the enclosing repository", () => {
+    useVcs.setState({ roots: ["/r", "/r/libs/core"] });
+    openLogTab("history", "/r/libs/core");
+    openLogTab("history", "/r/libs/core/src/Lib.kt");
+    openLogTab("history", "/r/libs");
+    expect(useGitLog.getState().logTabs.map((t) => t.repo)).toEqual(["/r/libs/core", "/r/libs/core", "/r"]);
+  });
+
   it("shows several repositories chosen one click at a time in the Repository filter", async () => {
     log.mockImplementation(async (repo: string) => ({ status: "ok", data: [commit(repo)] }));
     let repositories = toggleRepository(undefined, "/project/front");

src/features/vcs/logStore.ts

@@ -8,6 +8,7 @@ import { collapseLinear, computeGraph, emptyGraphState, type GraphRow, type Grap
 import { logOptions, setLogOptions, type LogOptions } from "./logOptions";
 import { clearConsole, errorMessage } from "./ops";
 import { currentRepo, currentRepoRoot, repoName, repoOf, useVcs } from "./store";
+import { stripSlash } from "./model";
 
 /** Date filter: commits made (committer time) after / before the given times (epoch ms). */
 export interface LogDateFilter {
@@ -262,12 +263,23 @@ export function selectGitTab(id: string) {
 
 let tabSeq = 0;
 
+/**
+ * The repository whose history Show History lists: a repository's own root (a submodule
+ * folder included) is its own history, as in IDEA, not the folder's history in the
+ * enclosing repository; any other path belongs to the innermost repository containing it.
+ */
+function historyRepo(target: string): string | null {
+  const roots = useVcs.getState().roots;
+  const path = stripSlash(target);
+  return roots.includes(path) ? path : repoOf(target);
+}
+
 /**
  * Opens (or selects) a log tab of its own, leaving the main Log and its filters as
  * they are: Show History for a file, Show Git Log for a branch.
  */
 export function openLogTab(kind: LogTab["kind"], target: string): string {
-  const repo = kind === "history" ? repoOf(target) : currentRepoRoot();
+  const repo = kind === "history" ? historyRepo(target) : currentRepoRoot();
   const existing = useGitLog.getState().logTabs.find((t) => t.kind === kind && t.target === target && t.repo === repo);
   if (existing) {
     selectGitTab(existing.id);