fix(panes): let toggleWindow be the authority, not a stale hasWindow() check

The tray menu asked "do we own a window for this pane?" and then acted on the
answer. Windows are destroyed asynchronously, so between the question and the
act the answer can go stale: hasWindow() says yes, the window is destroyed,
toggleWindow() returns false, the handler has already committed to the
main-process path and returns — and the click lands on nothing.

A tray item that silently does nothing is the worst possible failure here,
because the tray IS the recovery path when a pane is out of sight.

toggleWindow() already reports whether it did anything. Use that: if it toggled,
we're done; if it didn't, we never had that window (or just lost it), and only
the renderer can decide what opening the pane means — it might belong in the
dock, and its element lives there.

hasWindow()/hasPaneWindow() existed only to support the racy check, so they're
gone rather than left lying around for someone to reintroduce the race with.

Signed-off-by: topkoa <topkoa@gmail.com>

src/main/main.ts

@@ -128,7 +128,7 @@ import { installAppMenu } from './app-menu';
 import { sanitizeWindowBounds, MIN_WIDTH, MIN_HEIGHT } from './window-bounds';
 import {
     initPaneHosts, closeAllPanes, adoptPaneWindow, paneIdFromFrameName,
-    togglePaneWindow, showAllPaneWindows, hideAllPaneWindows, hasPaneWindow,
+    togglePaneWindow, showAllPaneWindows, hideAllPaneWindows,
 } from './pane-hosts';
 import { initTray, destroyTray } from './pane-tray';
 
@@ -1199,7 +1199,6 @@ async function startup(): Promise<void> {
         toggleWindow: togglePaneWindow,
         showAll: showAllPaneWindows,
         hideAll: hideAllPaneWindows,
-        hasWindow: hasPaneWindow,
     });
 
     // Install our application menu (replaces Electron's default so View →

src/main/pane-hosts.ts

@@ -269,11 +269,6 @@ export function hideAllPaneWindows(): void {
     refreshTray();
 }
 
-export function hasPaneWindow(paneId: string): boolean {
-    const win = windows.get(paneId);
-    return !!win && !win.isDestroyed();
-}
-
 // ── Wiring ──────────────────────────────────────────────────────────────────
 
 export function initPaneHosts(deps: { getMainWindow: () => BrowserWindow | null }): void {

src/main/pane-tray.ts

@@ -36,10 +36,11 @@ export interface TrayPane {
 // through initTray().
 export interface TrayPaneActions {
     getMainWindow: () => Electron.BrowserWindow | null;
+    // Returns true if it owned a window for this pane and toggled it; false if it
+    // did not, in which case only the renderer can decide what opening it means.
     toggleWindow: (paneId: string) => boolean;
     showAll: () => void;
     hideAll: () => void;
-    hasWindow: (paneId: string) => boolean;
 }
 
 let tray: Tray | null = null;
@@ -71,10 +72,15 @@ function buildMenu(): Menu {
         type: 'checkbox',
         checked: p.open === true,
         click: () => {
-            // If we already own a window for this pane, showing/hiding it is a
-            // main-process job and instant. If we don't, only the renderer can
-            // decide what opening it means (it might belong in the dock), so ask.
-            if (actions?.hasWindow(p.id)) { actions.toggleWindow(p.id); return; }
+            // Let toggleWindow() be the authority, rather than asking "do we have a
+            // window?" and then acting on the answer. Windows are destroyed
+            // asynchronously, so between the question and the act the answer can go
+            // stale — and the click would land on nothing and silently do nothing.
+            //
+            // If it toggled, we're done. If it didn't, we never had that window (or
+            // just lost it), and only the renderer can decide what opening the pane
+            // means — it might belong in the dock, and its element lives there.
+            if (actions?.toggleWindow(p.id)) return;
             const win = actions?.getMainWindow() ?? null;
             if (win && !win.isDestroyed()) win.webContents.send(IPC_PANE_EVENT_TOGGLE, { paneId: p.id });
         },