Prevent duplicate the cursor with -push.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@36848 72102866-910b-0410-8b05-ffd578937521

Source/NSCursor.m

@@ -35,11 +35,13 @@
 
 #import "AppKit/NSColor.h"
 #import "AppKit/NSCursor.h"
+#import "AppKit/NSEvent.h"
 #import "AppKit/NSGraphics.h"
 #import "AppKit/NSImage.h"
 #import "AppKit/NSBitmapImageRep.h"
 
 #import "GNUstepGUI/GSDisplayServer.h"
+#import "GNUstepGUI/GSTrackingRect.h"
 
 // Class variables
 static NSMutableArray *gnustep_gui_cursor_stack;
@@ -315,6 +317,8 @@ NSCursor *getStandardCursor(NSString *name, int style)
  */
 - (id) init
 {
+  _windowNum = -1;
+  _cursorRect = NSZeroRect;
   return [self initWithImage: nil hotSpot: NSZeroPoint];
 }
 
@@ -440,11 +444,26 @@ backgroundColorHint:(NSColor *)bg
     }
   else if (_cursor_flags.is_set_on_mouse_exited == NO)
     {
+      NSInteger num = [theEvent windowNumber];
+      GSTrackingRect *r =(GSTrackingRect*)[theEvent userData];
       /*
        * Undocumented behavior - if a cursor is not set on exit or entry,
        * we assume a push-pop situation instead.
        */
-      [self push];
+
+      /* First check if the cursor rect is currently updated. This prevent
+       * add the same cursor for the same cursor rect. This happen sometimes
+       * when the window become the main/key window, and the cursor is over
+       * a cursor rect.
+       */
+      if ( !(NSEqualRects(_cursorRect, r->rectangle) &&
+	     (_windowNum == num) &&
+	     [gnustep_gui_current_cursor isEqual: self]) )
+	{
+	  [self push];
+	  _windowNum = num;
+	  _cursorRect = r->rectangle;
+	}
     }
 }
 
@@ -466,6 +485,8 @@ backgroundColorHint:(NSColor *)bg
        * we assume a push-pop situation instead.
        */
       [self pop];
+      _windowNum = -1;
+      _cursorRect = NSZeroRect;
     }
   else
     {