fix(browser): preserve chat focus during agent browsing

electron/agent-browser/electron-adapter.ts

@@ -20,7 +20,7 @@ function isAllowedTopLevelUrl(value: string): boolean {
   }
 }
 
-function wrapDebugger(contents: WebContents): AgentBrowserDebuggerPort {
+function wrapDebugger(contents: WebContents, isVisible: () => boolean): AgentBrowserDebuggerPort {
   const debuggerEvents = contents.debugger as unknown as {
     on(event: string, listener: PortListener): void;
     removeListener(event: string, listener: PortListener): void;
@@ -29,8 +29,14 @@ function wrapDebugger(contents: WebContents): AgentBrowserDebuggerPort {
     attach: (version) => contents.debugger.attach(version),
     detach: () => contents.debugger.detach(),
     isAttached: () => contents.debugger.isAttached(),
-    sendCommand: (method, params, sessionRef) =>
-      contents.debugger.sendCommand(method, params, sessionRef),
+    sendCommand: async (method, params, sessionRef) => {
+      if (method === 'Page.captureScreenshot' && !isVisible()) {
+        // CDP capture can wait forever for a hidden view's compositor. Electron's
+        // native capture requests a frame without showing or focusing the view.
+        await contents.capturePage(undefined, { stayHidden: true, stayAwake: false });
+      }
+      return contents.debugger.sendCommand(method, params, sessionRef);
+    },
     on: (event, listener) => debuggerEvents.on(event, listener),
     removeListener: (event, listener) =>
       debuggerEvents.removeListener(event, listener),
@@ -53,13 +59,13 @@ function wrapNavigation(contents: WebContents): AgentBrowserNavigationPort {
   };
 }
 
-function wrapWebContents(contents: WebContents): AgentBrowserWebContentsPort {
+function wrapWebContents(contents: WebContents, isVisible: () => boolean): AgentBrowserWebContentsPort {
   const contentsEvents = contents as unknown as {
     on(event: string, listener: PortListener): void;
     removeListener(event: string, listener: PortListener): void;
   };
   return {
-    debugger: wrapDebugger(contents),
+    debugger: wrapDebugger(contents, isVisible),
     navigationHistory: wrapNavigation(contents),
     loadURL: (url) => contents.loadURL(url),
     getURL: () => contents.getURL(),
@@ -111,7 +117,7 @@ export class ElectronAgentBrowserAdapter implements AgentBrowserAdapter {
     this.guardSession(contents.session);
 
     const view: AgentBrowserViewPort = {
-      webContents: wrapWebContents(contents),
+      webContents: wrapWebContents(contents, () => nativeView.getVisible()),
       setBounds: (bounds: AgentBrowserBounds) =>
         nativeView.setBounds(this.toNativeBounds(bounds)),
       setVisible: (visible: boolean) => nativeView.setVisible(visible),