fix: Close the merge editor on Apply; confirm before terminating a running Run tab

Like IDEA, applying a merge result closes its tab, and closing a Run tab
whose process still runs asks before terminating it (with a Settings
toggle and "Do not ask again").

src/editor/core/controller.test.ts

@@ -65,6 +65,18 @@ describe("EditorController", () => {
     expect(openFilePaths(useTabs.getState())).toEqual(["/p/a.ts", "/p/b.ts"]);
   });
 
+  it("closes a tab by its input key", async () => {
+    ctrl = new EditorController(createMemoryBackend());
+    ctrl.start();
+    await ctrl.openFile("/p/a.ts", { focus: false });
+    await ctrl.openFile("/p/b.ts", { focus: false });
+    const key = Object.values(useTabs.getState().panes)
+      .flatMap((p) => p.tabs)
+      .find((t) => t.input.path === "/p/b.ts")!.input.key;
+    ctrl.closeInput(key);
+    expect(openFilePaths(useTabs.getState())).toEqual(["/p/a.ts"]);
+  });
+
   it("builds IDEA's editor tab menu", async () => {
     useProject.setState({ project: { name: "p", root: "/p", isGit: true, settings: {} } as never, settings: {} as never });
     const ids = ["navigate.selectIn", "project.revealInFinder", "vcs.localHistory", "vcs.commit", "project.copyAbsolutePath", "project.rename", "file.settings"];

src/editor/core/controller.ts

@@ -1003,6 +1003,10 @@ export class EditorController implements SlotHost {
     });
   }
 
+  closeInput(key: string) {
+    this.apply((s) => closeKey(s, key));
+  }
+
   activePath(): string | null {
     return this.activeSlot?.model.path ?? this.activeTabOf()?.input.path ?? null;
   }

src/editor/core/index.ts

@@ -40,6 +40,7 @@ export function activate(): void | (() => void) {
     focus: () => ctrl.focus(),
     openPaths: () => ctrl.openPaths(),
     closePath: (path) => ctrl.closePath(path),
+    closeInput: (key) => ctrl.closeInput(key),
   });
   _provideDocumentAttacher((path) => attachDocument(ctrl.manager, path));
   _provideCodePreview((path) => previewExtensions(path, ctrl.manager.settings()?.editor));