[gtk/gtk-3-24: 1/2] wayland: Emit dummy configure event when resizing while fixed

[Matthias Clasen <matthiasc src gnome org>]

commit a184b5bf51a17016cfed26d44d959642352fbb26
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Sep 7 17:51:23 2020 +0200

    wayland: Emit dummy configure event when resizing while fixed
    
    When a fixed size is active (e.g. the window is maximized),
    gtk_window_resize() shouldn't take immediate effect, so the request was
    dropped. This made GTK unhappy if this happened, it will freeze updating
    the window until it received the new size it demanded.
    
    Handle this by being nice and emitting a dummy GDK_CONFIGURE event with
    the old size where we previously ignored it. It won't resize the window
    immediately, so it shouldn't have a visible effect, and the size GTK
    requested is still saved away for when the window is unmaximized, but
    emitting the event will make GTK receive the event it expects.
    
    We still drop the request on the floor, e.g. if we still haven't seen
    the initial configuration, just as we do when actually doing the resize.
    
    Closes: https://gitlab.gnome.org/GNOME/gtk/-/issues/2907

 gdk/wayland/gdkwindow-wayland.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)
---
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index c91b882c9d..045368797d 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -3495,7 +3495,19 @@ gdk_window_wayland_move_resize (GdkWindow *window,
       if (!should_use_fixed_size (window->state) ||
           (width == impl->fixed_size_width &&
            height == impl->fixed_size_height))
-        gdk_wayland_window_maybe_configure (window, width, height, impl->scale);
+        {
+          gdk_wayland_window_maybe_configure (window,
+                                              width,
+                                              height,
+                                              impl->scale);
+        }
+      else if (!should_inhibit_resize (window))
+        {
+          gdk_wayland_window_configure (window,
+                                        window->width,
+                                        window->height,
+                                        impl->scale);
+        }
     }
 }