macosx: do not load windows if not necessary

modules/gui/macosx/AudioEffects.m

@@ -194,7 +194,7 @@
 #pragma mark generic code
 - (void)updateCocoaWindowLevel:(NSInteger)i_level
 {
-    if (self.window && [self.window isVisible] && [self.window level] != i_level)
+    if (self.isWindowLoaded && [self.window isVisible] && [self.window level] != i_level)
         [self.window setLevel: i_level];
 }
 

modules/gui/macosx/ResumeDialogController.m

@@ -122,7 +122,7 @@
 
 - (void)updateCocoaWindowLevel:(NSInteger)i_level
 {
-    if (self.window && [self.window isVisible] && [self.window level] != i_level)
+    if (self.isWindowLoaded && [self.window isVisible] && [self.window level] != i_level)
         [self.window setLevel: i_level];
 }
 

modules/gui/macosx/TrackSynchronization.m

@@ -88,7 +88,7 @@
 
 - (void)updateCocoaWindowLevel:(NSInteger)i_level
 {
-    if (self.window && [self.window isVisible] && [self.window level] != i_level)
+    if (self.isWindowLoaded && [self.window isVisible] && [self.window level] != i_level)
         [self.window setLevel: i_level];
 }
 

modules/gui/macosx/VideoEffects.m

@@ -210,7 +210,7 @@
 
 - (void)updateCocoaWindowLevel:(NSInteger)i_level
 {
-    if (self.window && [self.window isVisible] && [self.window level] != i_level)
+    if (self.isWindowLoaded && [self.window isVisible] && [self.window level] != i_level)
         [self.window setLevel: i_level];
 }
 

modules/gui/macosx/bookmarks.m

@@ -99,7 +99,7 @@
 
 - (void)updateCocoaWindowLevel:(NSInteger)i_level
 {
-    if (self.window && [self.window isVisible] && [self.window level] != i_level)
+    if (self.isWindowLoaded && [self.window isVisible] && [self.window level] != i_level)
         [self.window setLevel: i_level];
 }