[gtk/vulkan-no-layered-windows] gdkvulkancontext-win32.c: Suppress layered Windows on Vulkan

[Chun-wei Fan <fanchunwei src gnome org>]

commit 9c5ea8eba4853c936fc30b5b53ccec47c058baa6
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Nov 26 16:07:08 2019 +0800

    gdkvulkancontext-win32.c: Suppress layered Windows on Vulkan
    
    The Vulkan renderer does not work well with layered windows enabled, so
    turn it off when we successfully created the Vulkan context on Windows.

 gdk/win32/gdkvulkancontext-win32.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)
---
diff --git a/gdk/win32/gdkvulkancontext-win32.c b/gdk/win32/gdkvulkancontext-win32.c
index 583d762ecb..9588b5126b 100644
--- a/gdk/win32/gdkvulkancontext-win32.c
+++ b/gdk/win32/gdkvulkancontext-win32.c
@@ -40,7 +40,9 @@ gdk_win32_vulkan_context_create_surface (GdkVulkanContext *context,
 {
   GdkSurface *window = gdk_draw_context_get_surface (GDK_DRAW_CONTEXT (context));
   GdkDisplay *display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
+  GdkWin32Surface *win32_surface = GDK_WIN32_SURFACE (window);
   VkWin32SurfaceCreateInfoKHR info;
+  VkResult result;
 
   info.sType = VK_STRUCTURE_TYPE_WIN32_SURFACE_CREATE_INFO_KHR;
   info.pNext = NULL;
@@ -55,11 +57,19 @@ gdk_win32_vulkan_context_create_surface (GdkVulkanContext *context,
    */
   gdk_display_sync (display);
 
-  return GDK_VK_CHECK (vkCreateWin32SurfaceKHR,
-                       gdk_vulkan_context_get_instance (context),
-                       &info,
-                       NULL,
-                       surface);
+  result = GDK_VK_CHECK (vkCreateWin32SurfaceKHR,
+                         gdk_vulkan_context_get_instance (context),
+                         &info,
+                         NULL,
+                         surface);
+
+  if (result == VK_SUCCESS)
+    win32_surface->suppress_layered ++;
+
+  if (win32_surface->suppress_layered == 1)
+    _gdk_win32_surface_update_style_bits (window);
+
+  return result;
 }
 
 static void