macosx: fix fullscreen button state in mainwindow

The button state now indicates if the next video will be started in
fullscreen, or there is already one video in fullscreen.

modules/gui/macosx/MainWindow.m

@@ -383,6 +383,11 @@ static VLCMainWindow *_o_sharedInstance = nil;
         nativeVideoSize = screenSize;
         [self resizeWindow];
     }
+
+    // update fs button to reflect state for next startup
+    if (var_InheritBool(pl_Get(VLCIntf), "fullscreen")) {
+        [o_controls_bar setFullscreenState:YES];
+    }
 }
 
 #pragma mark -
@@ -718,6 +723,11 @@ static VLCMainWindow *_o_sharedInstance = nil;
         if (!b_nonembedded && !b_fullscreen && frameBeforePlayback.size.width > 0 && frameBeforePlayback.size.height > 0)
             [[self animator] setFrame:frameBeforePlayback display:YES];
 
+        // update fs button to reflect state for next startup
+        if (var_InheritBool(pl_Get(VLCIntf), "fullscreen")) {
+            [o_controls_bar setFullscreenState:YES];
+        }
+
         [self makeFirstResponder: nil];
 
         if ([self level] != NSNormalWindowLevel)

modules/gui/macosx/Windows.m

@@ -542,6 +542,7 @@
 
     if (o_controls_bar)
         [o_controls_bar setFullscreenState:YES];
+    [[[VLCMainWindow sharedInstance] controlsBar] setFullscreenState:YES];
 
     [[VLCMainWindow sharedInstance] recreateHideMouseTimer];
 
@@ -696,6 +697,7 @@
 
     if (o_controls_bar)
         [o_controls_bar setFullscreenState:NO];
+    [[[VLCMainWindow sharedInstance] controlsBar] setFullscreenState:NO];
 
     /* We always try to do so */
     [NSScreen unblackoutScreens];