fix(github): make Change Repository or Account… work before a repository is connected (#1492)

The action was only enabled while the Pull Requests tool window was connected to
a repository, so from Find Action or a shortcut it did nothing in a project that
wasn't connected yet (gh not installed or not logged in, or several GitHub
remotes to choose from). It is now available in any open project: connected, it
forgets the choice and shows the repository selector as before; not connected,
it opens the Pull Requests tool window, which shows the selector or how to log in.

Fixes #1464

src/features/github/index.ts

@@ -144,8 +144,9 @@ function actions(): Action[] {
       id: "github.changeRepository",
       title: "Change Repository or Account…",
       category: "GitHub",
-      when: CONNECTED,
-      run: () => changeRepository(),
+      when: WHEN,
+      // Not connected yet: the tool window offers the repository selector, or explains how to log in.
+      run: () => (useGhRepository.getState().connection ? changeRepository() : void showPullRequests()),
     },
     {
       // pull.request.select.action

src/features/github/toolwindow/toolwindow.test.tsx

@@ -3,7 +3,7 @@ import { act, render, screen } from "@testing-library/react";
 import { getAction } from "@/platform/actions";
 import { getContext } from "@/platform/context";
 import * as ipc from "@/platform/ipc";
-import { useContributions } from "@/workbench/contributions";
+import { provideToolWindowService, useContributions, type ToolWindowService } from "@/workbench/contributions";
 import { activate } from "../index";
 import { setCurrentRepository } from "../api/client";
 import type { GHRepository, GHUser } from "../api/types";
@@ -114,6 +114,14 @@ describe("tool window", () => {
       expect(getAction(id), id).toBeDefined();
   });
 
+  it("opens the tool window for Change Repository or Account while not connected", async () => {
+    const show = vi.fn();
+    provideToolWindowService({ show } as unknown as ToolWindowService);
+    useGhRepository.setState({ availability: { kind: "notInstalled" } });
+    await getAction("github.changeRepository")!.run({ arg: undefined, ctx: { projectOpen: true } });
+    expect(show).toHaveBeenCalledWith("pullRequests", true);
+  });
+
   it("shows gh's state when it is not ready", () => {
     useGhRepository.setState({ availability: { kind: "notInstalled" } });
     render(<PullRequestsToolWindow />);