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Re: [PATCH] ui/cocoa: Fix switched_to_fullscreen warning


From: Akihiko Odaki
Subject: Re: [PATCH] ui/cocoa: Fix switched_to_fullscreen warning
Date: Sat, 2 Jul 2022 23:30:16 +0900
User-agent: Mozilla/5.0 (X11; Linux aarch64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0

Reviewed-by: Akihiko Odaki <akihiko.odaki@gmail.com>

On 2022/07/02 13:43, Peter Delevoryas wrote:
I noticed this error while building QEMU on Mac OS X:

     [1040/1660] Compiling Objective-C object libcommon.fa.p/ui_cocoa.m.o
     ../ui/cocoa.m:803:17: warning: variable 'switched_to_fullscreen' set but 
not used [-Wunused-but-set-variable]
         static bool switched_to_fullscreen = false;
                     ^
     1 warning generated.

I think the behavior is fine if you remove "switched_to_fullscreen", I can
still switch in and out of mouse grabbed mode and fullscreen mode with this
change, and Command keycodes will only be passed to the guest if the mouse
is grabbed, which I think is the right behavior. I'm not sure why a static
piece of state was needed to handle that in the first place. Perhaps the
refactoring of the flags-state-change fixed that by toggling the Command
keycode on.

I tested this with an Ubuntu core image on macOS 12.4

     wget 
https://cdimage.ubuntu.com/ubuntu-core/18/stable/current/ubuntu-core-18-i386.img.xz
     xz -d ubuntu-core-18-i386.img.xz
     qemu-system-x86_64 -drive file=ubuntu-core-18.i386.img,format=raw

Fixes: 6d73bb643aa7 ("ui/cocoa: Clear modifiers whenever possible")
Signed-off-by: Peter Delevoryas <peter@pjd.dev>
---
  ui/cocoa.m | 8 --------
  1 file changed, 8 deletions(-)

diff --git a/ui/cocoa.m b/ui/cocoa.m
index 84c84e98fc..13e208b037 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -800,7 +800,6 @@ - (bool) handleEventLocked:(NSEvent *)event
      int buttons = 0;
      int keycode = 0;
      bool mouse_event = false;
-    static bool switched_to_fullscreen = false;
      // Location of event in virtual screen coordinates
      NSPoint p = [self screenLocationOfEvent:event];
      NSUInteger modifiers = [event modifierFlags];
@@ -952,13 +951,6 @@ - (bool) handleEventLocked:(NSEvent *)event
// forward command key combos to the host UI unless the mouse is grabbed
              if (!isMouseGrabbed && ([event modifierFlags] & 
NSEventModifierFlagCommand)) {
-                /*
-                 * Prevent the command key from being stuck down in the guest
-                 * when using Command-F to switch to full screen mode.
-                 */
-                if (keycode == Q_KEY_CODE_F) {
-                    switched_to_fullscreen = true;
-                }
                  return false;
              }



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