From: Christian Hergert <christian@hergert.me>
Date: Thu, 17 Feb 2022 01:09:48 +0000 (-0800)
Subject: macos: fix window drag across mixed-scale monitors
X-Git-Tag: archive/raspbian/4.6.5+ds-1+rpi1~1^2~19^2~3^2~72^2~6
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=493f90499b35d0b5c54572becad80494d6a9fb50;p=gtk4.git

macos: fix window drag across mixed-scale monitors

If we have a 2x scale laptop with a 1x scale external display, we would
need to create a new IOSurface for the external display once it crosses
a boundary, otherwise we won't have something capable of displaying
correctly on the second monitor.
---

diff --git a/gdk/macos/gdkmacossurface.c b/gdk/macos/gdkmacossurface.c
index fe7c7cc34f..cc7bbd9b9b 100644
--- a/gdk/macos/gdkmacossurface.c
+++ b/gdk/macos/gdkmacossurface.c
@@ -1017,6 +1017,9 @@ _gdk_macos_surface_monitor_changed (GdkMacosSurface *self)
       g_object_unref (monitor);
     }
 
+  /* We need to create a new IOSurface for this monitor */
+  g_clear_object (&self->buffer);
+
   _gdk_macos_surface_configure (self);
 
   gdk_surface_invalidate_rect (GDK_SURFACE (self), NULL);