[gtk/wip/chergert/quartz4u] macos: update trackin rect after showing

[Christian Hergert <chergert src gnome org>]

commit be3ae933d91fa479f07395c1315ebb8891620fe0
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 4 15:26:41 2020 -0700

    macos: update trackin rect after showing

 gdk/macos/GdkMacosWindow.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gdk/macos/GdkMacosWindow.c b/gdk/macos/GdkMacosWindow.c
index 3e1ac5be61..efe54cce8b 100644
--- a/gdk/macos/GdkMacosWindow.c
+++ b/gdk/macos/GdkMacosWindow.c
@@ -296,6 +296,8 @@
   inShowOrHide = NO;
 
   [self checkSendEnterNotify];
+
+  [[self contentView] updateTrackingRect];
 }
 
 -(void)hide