[gtk: 1/2] macos: prohibit fullscreen transition if in transtion

[Christian Hergert <chergert src gnome org>]

commit 146bb70c2e09568c8e8d5f942fcfcf9ef322f572
Author: sumibi-yakitori <nekosoft360 gmail com>
Date:   Sun Apr 3 22:14:52 2022 +0000

    macos: prohibit fullscreen transition if in transtion
    
    This prevents performing additional fullscreen transitions while
    a transition is already in progress.

 gdk/macos/GdkMacosWindow.c          | 11 +++++++++++
 gdk/macos/GdkMacosWindow.h          |  2 ++
 gdk/macos/gdkmacostoplevelsurface.c | 12 ++++++------
 3 files changed, 19 insertions(+), 6 deletions(-)
---
diff --git a/gdk/macos/GdkMacosWindow.c b/gdk/macos/GdkMacosWindow.c
index 23b3f5a3f3..0eb1ec7ca8 100644
--- a/gdk/macos/GdkMacosWindow.c
+++ b/gdk/macos/GdkMacosWindow.c
@@ -171,6 +171,11 @@ typedef NSString *CALayerContentsGravity;
   return inMove;
 }
 
+- (BOOL)inFullscreenTransition;
+{
+  return inFullscreenTransition;
+}
+
 -(void)checkSendEnterNotify
 {
   /* When a new window has been created, and the mouse is in the window
@@ -759,31 +764,37 @@ typedef NSString *CALayerContentsGravity;
 
 -(void)windowWillEnterFullScreen:(NSNotification *)aNotification
 {
+  inFullscreenTransition = YES;
   lastUnfullscreenFrame = [self frame];
 }
 
 -(void)windowDidEnterFullScreen:(NSNotification *)aNotification
 {
+  inFullscreenTransition = NO;
   initialPositionKnown = NO;
   [self checkSendEnterNotify];
 }
 
 -(void)windowWillExitFullScreen:(NSNotification *)aNotification
 {
+  inFullscreenTransition = YES;
 }
 
 -(void)windowDidExitFullScreen:(NSNotification *)aNotification
 {
+  inFullscreenTransition = NO;
   initialPositionKnown = NO;
   [self checkSendEnterNotify];
 }
 
 -(void)windowDidFailToEnterFullScreen:(NSNotification *)aNotification
 {
+  inFullscreenTransition = NO;
 }
 
 -(void)windowDidFailToExitFullScreen:(NSNotification *)aNotification
 {
+  inFullscreenTransition = NO;
 }
 
 -(void)windowDidChangeScreen:(NSNotification *)aNotification
diff --git a/gdk/macos/GdkMacosWindow.h b/gdk/macos/GdkMacosWindow.h
index 3a514ea857..1cf9ec805c 100644
--- a/gdk/macos/GdkMacosWindow.h
+++ b/gdk/macos/GdkMacosWindow.h
@@ -53,6 +53,7 @@
   NSRect           lastMaximizedFrame;
   NSRect           lastUnfullscreenFrame;
   BOOL             inMaximizeTransition;
+  BOOL             inFullscreenTransition;
 }
 
 -(void)beginManualMove;
@@ -70,5 +71,6 @@
 -(void)setDecorated:(BOOL)decorated;
 -(void)swapBuffer:(GdkMacosBuffer *)buffer withDamage:(const cairo_region_t *)damage;
 -(BOOL)needsMouseDownQuirk;
+-(BOOL)inFullscreenTransition;
 
 @end
diff --git a/gdk/macos/gdkmacostoplevelsurface.c b/gdk/macos/gdkmacostoplevelsurface.c
index 1759077563..aa828fcfa5 100644
--- a/gdk/macos/gdkmacostoplevelsurface.c
+++ b/gdk/macos/gdkmacostoplevelsurface.c
@@ -33,26 +33,26 @@
 static void
 _gdk_macos_toplevel_surface_fullscreen (GdkMacosToplevelSurface *self)
 {
-  NSWindow *window;
+  GdkMacosWindow *window;
 
   g_assert (GDK_IS_MACOS_TOPLEVEL_SURFACE (self));
 
-  window = _gdk_macos_surface_get_native (GDK_MACOS_SURFACE (self));
+  window = (GdkMacosWindow *)_gdk_macos_surface_get_native (GDK_MACOS_SURFACE (self));
 
-  if (([window styleMask] & NSWindowStyleMaskFullScreen) == 0)
+  if (![window inFullscreenTransition] && ([window styleMask] & NSWindowStyleMaskFullScreen) == 0)
     [window toggleFullScreen:window];
 }
 
 static void
 _gdk_macos_toplevel_surface_unfullscreen (GdkMacosToplevelSurface *self)
 {
-  NSWindow *window;
+  GdkMacosWindow *window;
 
   g_assert (GDK_IS_MACOS_TOPLEVEL_SURFACE (self));
 
-  window = _gdk_macos_surface_get_native (GDK_MACOS_SURFACE (self));
+  window = (GdkMacosWindow *)_gdk_macos_surface_get_native (GDK_MACOS_SURFACE (self));
 
-  if (([window styleMask] & NSWindowStyleMaskFullScreen) != 0)
+  if (![window inFullscreenTransition] && ([window styleMask] & NSWindowStyleMaskFullScreen) != 0)
     [window toggleFullScreen:window];
 }