[gtk/wip/chergert/quartz4u: 95/120] macos: clamp toplevel present to workarea for first present

[Christian Hergert <chergert src gnome org>]

commit 9295a73106d50ecd9240cd5a2ffa0cb3f0f5b684
Author: Christian Hergert <chergert redhat com>
Date:   Thu May 21 09:45:33 2020 -0700

    macos: clamp toplevel present to workarea for first present
    
    This helps ensure that CSD windows do not fall outside the workarea
    for their first present. SSD windows already seem to get that so we
    don't need to deal with them specially.

 gdk/macos/gdkmacostoplevelsurface.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)
---
diff --git a/gdk/macos/gdkmacostoplevelsurface.c b/gdk/macos/gdkmacostoplevelsurface.c
index 7734b20420..bc5c398916 100644
--- a/gdk/macos/gdkmacostoplevelsurface.c
+++ b/gdk/macos/gdkmacostoplevelsurface.c
@@ -156,8 +156,25 @@ _gdk_macos_toplevel_surface_present (GdkToplevel       *toplevel,
           (GDK_MACOS_SURFACE (self)->shadow_left ||
            GDK_MACOS_SURFACE (self)->shadow_top))
         {
-          int x = GDK_SURFACE (self)->x - GDK_MACOS_SURFACE (self)->shadow_left;
-          int y = GDK_SURFACE (self)->y - GDK_MACOS_SURFACE (self)->shadow_top;
+          GdkMonitor *monitor = _gdk_macos_surface_get_best_monitor (GDK_MACOS_SURFACE (self));
+          int x = GDK_SURFACE (self)->x;
+          int y = GDK_SURFACE (self)->y;
+
+          if (monitor != NULL)
+            {
+              GdkRectangle visible;
+
+              gdk_monitor_get_workarea (monitor, &visible);
+
+              if (x < visible.x)
+                x = visible.x;
+
+              if (y < visible.y)
+                y = visible.y;
+            }
+
+          x -= GDK_MACOS_SURFACE (self)->shadow_left;
+          y -= GDK_MACOS_SURFACE (self)->shadow_top;
 
           _gdk_macos_surface_move (GDK_MACOS_SURFACE (self), x, y);
         }