macosx: don't draw the time slider's 'fancy gradient effect' on Leopard, since...

macosx: don't draw the time slider's 'fancy gradient effect' on Leopard, since this leads to ugly artifacts due to the outdated CoreAnimation version
(cherry picked from commit cd4bf104f3db9527581865f44312dbdd696eab39)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/macosx/CompatibilityFixes.h

@@ -82,7 +82,7 @@ enum {
     NSApplicationPresentationAutoHideToolbar            = (1 << 11)
 };
 
-/* the follow is just to fix warnings, not for implementation! */
+/* the following is just to fix warnings, not for implementation! */
 @interface NSWindow (IntroducedInLion)
 - (void)setRestorable:(BOOL)b_value;
 - (void)toggleFullScreen:(id)id_value;

modules/gui/macosx/MainWindow.m

@@ -422,6 +422,9 @@ static VLCMainWindow *_o_sharedInstance = nil;
 
     if ([self styleMask] & NSResizableWindowMask)
         [o_resize_view removeFromSuperviewWithoutNeedingDisplay];
+
+    if (OSX_LEOPARD)
+        [o_time_sld_fancygradient_view removeFromSuperviewWithoutNeedingDisplay];
 }
 
 #pragma mark -
@@ -683,6 +686,11 @@ static VLCMainWindow *_o_sharedInstance = nil;
     return YES;
 }
 
+- (BOOL)isMainWindow
+{
+	return YES;
+}
+
 - (void)setTitle:(NSString *)title
 {
     if (b_dark_interface)
@@ -1019,6 +1027,9 @@ static VLCMainWindow *_o_sharedInstance = nil;
 
 - (void)drawFancyGradientEffectForTimeSlider
 {
+    if (OSX_LEOPARD)
+        return;
+
     NSAutoreleasePool * o_pool = [[NSAutoreleasePool alloc] init];
     CGFloat f_value = [o_time_sld knobPosition];
     if (f_value > 7.5)
@@ -1150,6 +1161,7 @@ static VLCMainWindow *_o_sharedInstance = nil;
     if (b_fullscreen) {
         [self recreateHideMouseTimer];
     }
+    [super mouseMoved: theEvent];
 }
 
 - (void)recreateHideMouseTimer