From 94fc11313b34e3b35aa275dad1c3bc2455a24ec3 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 4 Nov 2019 14:32:29 +0100
Subject: [PATCH xserver 23/24] xwayland: Fix setting of
 _XWAYLAND_RANDR_EMU_MONITOR_RECTS prop on new windows

For window-manager managed windows, xwl_realize_window is only called for
the window-manager's decoration window and not for the actual client window
on which we should set the _XWAYLAND_RANDR_EMU_MONITOR_RECTS prop.

Usualy this is not a problem since we walk all client windows to update
the property when the resolution is changed through a randr call.

But for apps which first do the randr change and only then create their
window this does not work, and our xwl_output_set_window_randr_emu_props
call in xwl_realize_window is a no-op as that is only called for the wm
decoration window and not for the actual client's window.

This commit fixes this by making ensure_surface_for_window() call
xwl_output_set_window_randr_emu_props on the first and only child of
window-manager managed windows.

Note this also removes the non-functional xwl_output_set_window_randr_emu_props
call from xwl_realize_window, which was intended to do this, but does not
work.

This fixes apps using the ogre3d library always running at the
monitors native resolution.

Acked-by: Olivier Fourdan <ofourdan@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 148f428dfccf606b932a00d5a00af06e8dca8a7e)
---
 hw/xwayland/xwayland.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/hw/xwayland/xwayland.c b/hw/xwayland/xwayland.c
index 734e76b2e..a7c4f82df 100644
--- a/hw/xwayland/xwayland.c
+++ b/hw/xwayland/xwayland.c
@@ -751,6 +751,7 @@ ensure_surface_for_window(WindowPtr window)
     struct xwl_screen *xwl_screen;
     struct xwl_window *xwl_window;
     struct wl_region *region;
+    WindowPtr toplevel;
 
     if (xwl_window_get(window))
         return TRUE;
@@ -821,7 +822,14 @@ ensure_surface_for_window(WindowPtr window)
 
     xwl_window_init_allow_commits(xwl_window);
 
-    if (!window_is_wm_window(window)) {
+    /* When a new window-manager window is realized, then the randr emulation
+     * props may have not been set on the managed client window yet.
+     */
+    if (window_is_wm_window(window)) {
+        toplevel = window_get_client_toplevel(window);
+        if (toplevel)
+            xwl_output_set_window_randr_emu_props(xwl_screen, toplevel);
+    } else {
         /* CSD or O-R toplevel window, check viewport on creation */
         xwl_window_check_resolution_change_emulation(xwl_window);
     }
@@ -870,8 +878,6 @@ xwl_realize_window(WindowPtr window)
             return FALSE;
     }
 
-    xwl_output_set_window_randr_emu_props(xwl_screen, window);
-
     return ensure_surface_for_window(window);
 }
 
-- 
2.26.2