update tracking area on OSX when resizing view

PanoPainter-OSX/main.cpp

@@ -125,7 +125,7 @@ std::mutex task_mutex;
     [self setPixelFormat:pf];
     [self setOpenGLContext:context];
 
-    NSTrackingArea* trackingArea = [[NSTrackingArea alloc] initWithRect:frameRect
+    self->trackingArea = [[NSTrackingArea alloc] initWithRect:frameRect
             options: (NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved | NSTrackingActiveInKeyWindow )
             owner:self userInfo:nil];
     [self addTrackingArea:trackingArea];
@@ -266,20 +266,28 @@ static CVReturn MyDisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTime
     CGLFlushDrawable(cgl);
     CGLUnlockContext(cgl);
 }
-
+- (void)updateTrackingAreas
+{
+    if(self->trackingArea != nil)
+        [self removeTrackingArea:self->trackingArea];
+    self->trackingArea = [[NSTrackingArea alloc] initWithRect:[self bounds]
+            options: (NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved | NSTrackingActiveInKeyWindow)
+            owner:self userInfo:nil];
+    [self addTrackingArea:trackingArea];
+}
 - (void)reshape
 {
     [super reshape];
     
+    // Get the view size in Points
+    NSRect viewRectPoints = [self bounds];
+
     // We draw on a secondary thread through the display link. However, when
     // resizing the view, -drawRect is called on the main thread.
     // Add a mutex around to avoid the threads accessing the context
     // simultaneously when resizing.
     CGLLockContext([[self openGLContext] CGLContextObj]);
     
-    // Get the view size in Points
-    NSRect viewRectPoints = [self bounds];
-    
 #if SUPPORT_RETINA_RESOLUTION
     
     // Rendering at retina resolutions will reduce aliasing, but at the potential