Fix transparent window having border on OS X 10.9

zcbenz · zcbenz · commit 2ee8142136c9 · 2016-07-12T15:01:37.000+09:00
diff --git a/atom/browser/native_window_mac.mm b/atom/browser/native_window_mac.mm
@@ -1082,7 +1082,10 @@ static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
 
 void NativeWindowMac::InstallView() {
   // Make sure the bottom corner is rounded: http://crbug.com/396264.
-  [[window_ contentView] setWantsLayer:YES];
+  // But do not enable it on OS X 10.9 for transparent window, otherwise a
+  // semi-transparent frame would show.
+  if (!(transparent() && base::mac::IsOSMavericks()))
+    [[window_ contentView] setWantsLayer:YES];
 
   NSView* view = inspectable_web_contents()->GetView()->GetNativeView();
   if (has_frame()) {
