macosx: save window position manually when using the dark interface style

(cherry picked from commit d3415155)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/macosx/MainWindow.h

@@ -133,6 +133,7 @@
 
 - (void)setTitle:(NSString *)title;
 - (void) customZoom: (id)sender;
+- (void)windowResizedOrMoved:(NSNotification *)notification;
 
 - (void)showDropZone;
 - (void)hideDropZone;

modules/gui/macosx/MainWindow.m

@@ -109,6 +109,7 @@ static VLCMainWindow *_o_sharedInstance = nil;
 
 - (void)dealloc
 {
+    [[NSNotificationCenter defaultCenter] removeObserver: self];
     config_PutInt( VLCIntf->p_libvlc, "volume", i_lastShownVolume );
     [self saveFrameUsingName: [self frameAutosaveName]];
     [o_sidebaritems release];
@@ -394,6 +395,9 @@ static VLCMainWindow *_o_sharedInstance = nil;
 
     if( b_dark_interface )
     {
+        [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(windowResizedOrMoved:) name: NSWindowDidResizeNotification object: nil];
+        [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(windowResizedOrMoved:) name: NSWindowDidMoveNotification object: nil];
+
         NSRect winrect;
         CGFloat f_titleBarHeight = [o_titlebar_view frame].size.height;
         winrect = [self frame];
@@ -797,6 +801,11 @@ static VLCMainWindow *_o_sharedInstance = nil;
     [self setFrame: maxRect display: YES animate: YES];
 }
 
+- (void)windowResizedOrMoved:(NSNotification *)notification
+{
+    [self saveFrameUsingName: [self frameAutosaveName]];
+}
+
 #pragma mark -
 #pragma mark Update interface and respond to foreign events
 - (void)showDropZone