fix: fire show event when BrowserWindow shown via maximize() (#33212)

Co-authored-by: David Sanders <[email protected]>

shell/browser/native_window_views.cc

@@ -568,11 +568,13 @@ void NativeWindowViews::SetEnabledInternal(bool enable) {
 
 #if defined(OS_LINUX)
 void NativeWindowViews::Maximize() {
-  if (IsVisible())
+  if (IsVisible()) {
     widget()->Maximize();
-  else
+  } else {
     widget()->native_widget_private()->Show(ui::SHOW_STATE_MAXIMIZED,
                                             gfx::Rect());
+    NotifyWindowShow();
+  }
 }
 #endif
 

shell/browser/native_window_views_win.cc

@@ -176,12 +176,13 @@ HHOOK NativeWindowViews::mouse_hook_ = NULL;
 void NativeWindowViews::Maximize() {
   // Only use Maximize() when window is NOT transparent style
   if (!transparent()) {
-    if (IsVisible())
+    if (IsVisible()) {
       widget()->Maximize();
-    else
+    } else {
       widget()->native_widget_private()->Show(ui::SHOW_STATE_MAXIMIZED,
                                               gfx::Rect());
-    return;
+      NotifyWindowShow();
+    }
   } else {
     restore_bounds_ = GetBounds();
     auto display = display::Screen::GetScreen()->GetDisplayNearestWindow(

spec-main/api-browser-window-spec.ts

@@ -3550,6 +3550,29 @@ describe('BrowserWindow module', () => {
     });
   });
 
+  // TODO(dsanders11): Enable once maximize event works on Linux again on CI
+  ifdescribe(process.platform !== 'linux')('BrowserWindow.maximize()', () => {
+    afterEach(closeAllWindows);
+    // TODO(dsanders11): Disabled on macOS, see https://github.com/electron/electron/issues/32947
+    ifit(process.platform !== 'darwin')('should show the window if it is not currently shown', async () => {
+      const w = new BrowserWindow({ show: false });
+      const hidden = emittedOnce(w, 'hide');
+      const shown = emittedOnce(w, 'show');
+      const maximize = emittedOnce(w, 'maximize');
+      expect(w.isVisible()).to.be.false('visible');
+      w.maximize();
+      await maximize;
+      expect(w.isVisible()).to.be.true('visible');
+      // Even if the window is already maximized
+      w.hide();
+      await hidden;
+      expect(w.isVisible()).to.be.false('visible');
+      w.maximize();
+      await shown; // Ensure a 'show' event happens when it becomes visible
+      expect(w.isVisible()).to.be.true('visible');
+    });
+  });
+
   describe('BrowserWindow.unmaximize()', () => {
     afterEach(closeAllWindows);
     it('should restore the previous window position', () => {