Improve terminal renderer recovery

packages/desktop/src/main.ts

@@ -21,6 +21,7 @@ import {
   getMainWindowChromeOptions,
   getWindowBackgroundColor,
   resolveSystemWindowTheme,
+  setupDarwinPaintRefresh,
   setupWindowResizeEvents,
   setupDefaultContextMenu,
   setupDragDropPrevention,
@@ -189,6 +190,7 @@ async function createMainWindow(): Promise<void> {
     app.dock?.setBadge(devWorktreeName);
   }
 
+  setupDarwinPaintRefresh(mainWindow);
   setupWindowResizeEvents(mainWindow);
   setupDefaultContextMenu(mainWindow);
   setupDragDropPrevention(mainWindow);

packages/desktop/src/window/window-manager.ts

@@ -219,6 +219,59 @@ export function setupWindowResizeEvents(win: BrowserWindow): void {
   });
 }
 
+function refreshChromiumSurface(win: BrowserWindow): void {
+  if (win.isDestroyed()) {
+    return;
+  }
+
+  win.webContents.invalidate();
+  if (win.isMaximized() || win.isFullScreen()) {
+    return;
+  }
+
+  const [width, height] = win.getSize();
+  win.setSize(width + 1, height);
+  setTimeout(() => {
+    if (!win.isDestroyed()) {
+      win.setSize(width, height);
+    }
+  }, 32);
+}
+
+export function setupDarwinPaintRefresh(win: BrowserWindow): void {
+  if (process.platform !== "darwin") {
+    return;
+  }
+
+  win.webContents.setBackgroundThrottling(false);
+
+  const requestSurfaceRefresh = () => {
+    if (!win.isDestroyed()) {
+      win.webContents.invalidate();
+    }
+  };
+  const handleChildProcessGone = (
+    _event: Electron.Event,
+    details: { type?: string; reason?: string },
+  ) => {
+    if (details.type !== "GPU") {
+      return;
+    }
+
+    console.warn("[window] GPU process gone:", details.reason);
+    refreshChromiumSurface(win);
+  };
+
+  win.on("restore", requestSurfaceRefresh);
+  win.on("show", requestSurfaceRefresh);
+  app.on("child-process-gone", handleChildProcessGone);
+  win.once("closed", () => {
+    win.off("restore", requestSurfaceRefresh);
+    win.off("show", requestSurfaceRefresh);
+    app.off("child-process-gone", handleChildProcessGone);
+  });
+}
+
 export function setupDefaultContextMenu(win: BrowserWindow): void {
   win.webContents.on("context-menu", (_event, params) => {
     const menu = Menu.buildFromTemplate([