src/macosx/native/sun/awt/AWTView.m

@@ -227,10 +227,12 @@
         [[self nextResponder] mouseDown:event];
     }
 }
 
 - (void) mouseDragged: (NSEvent *)event {
+    // synthesize mouse enter/exit events during drag
+    [AWTWindow synthesizeMouseEnteredExitedEventsForAllWindows];
     [self deliverJavaMouseEvent: event];
 }
 
 - (void) rightMouseDragged: (NSEvent *)event {
     [self deliverJavaMouseEvent: event];