Prevent blinking of appicon double-clicking on it.

Additional NSWindow and NSView overrides prevent redaundant call to makeKeyAndOrderFront.
Checks for [NSIconWindow becomesKeyOnlyIfNeeded] and [NSIconView needsPanelToBecomeKey]
are performed in NSWindow.m line 3871.

Source/NSApplication.m

@@ -434,6 +434,11 @@ NSApplication	*NSApp = nil;
   return NO;
 }
 
+- (BOOL) becomesKeyOnlyIfNeeded
+{
+  return YES;
+}
+
 - (BOOL) worksWhenModal
 {
   return YES;
@@ -542,6 +547,11 @@ static NSSize scaledIconSizeForSize(NSSize imageSize)
   return YES;
 }
 
+- (BOOL) needsPanelToBecomeKey
+{
+  return NO;
+}
+
 - (void) concludeDragOperation: (id<NSDraggingInfo>)sender
 {
 }