macosx/vlc_app: Display an indicator when waiting for playlist content.

projects/macosx/vlc_app/Sources/VLCMainWindowController.h

@@ -58,7 +58,7 @@
     IBOutlet VLCBrowsableVideoView * videoView;
 
     /* Controllers */
-    IBOutlet NSTreeController * categoriesTreeController;
+    NSTreeController * categoriesTreeController;
     IBOutlet VLCMediaArrayController * mediaArrayController;
     IBOutlet VLCMediaPlayer * mediaPlayer;
     IBOutlet VLCController * controller; /* This is a VLCController binded to the File's Owner of the nib */
@@ -74,6 +74,7 @@
 @property (readonly) VLCMediaPlayer * mediaPlayer;
 @property (readonly) VLCBrowsableVideoView * videoView;
 @property (readonly) VLCMediaArrayController * mediaArrayController;
+@property (readonly) NSTreeController * categoriesTreeController;
 
 - (IBAction)mediaListViewItemDoubleClicked:(id)sender;
 - (void)videoViewItemClicked:(id)sender;

projects/macosx/vlc_app/Sources/VLCMainWindowController.m

@@ -35,6 +35,7 @@
 @synthesize mediaPlayer;
 @synthesize videoView;
 @synthesize mediaArrayController;
+@synthesize categoriesTreeController;
 
 - (void)awakeFromNib
 {
@@ -45,8 +46,9 @@
      */
 
     NSAssert( mediaPlayer, @"No mediaPlayer" );
-    
+    [self willChangeValueForKey:@"categoriesTreeController"];
     categoriesTreeController = [[NSTreeController alloc] init];
+    [self didChangeValueForKey:@"categoriesTreeController"];
 
     /***********************************
      * CategoriesList OutlineView content