From 7b04e8be157b64dc52e3069752bf753a243ad51f Mon Sep 17 00:00:00 2001
From: Gergo Koteles <soyer@irl.hu>
Date: Wed, 19 Jul 2023 01:19:16 +0200
Subject: [PATCH] wayland: Find touch grab sequence in subsurfaces also

With libdecor, window moving/resizing only works with
the pointer, not with touch.
The meta_wayland_pointer_can_grab_surface checks for subsurfaces,
but the meta_wayland_touch_find_grab_sequence does not.

Add a similar subsurface check to
meta_wayland_touch_find_grab_sequence.

Closes: GNOME/mutter#2872
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3125>
---
 src/wayland/meta-wayland-touch.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/wayland/meta-wayland-touch.c b/src/wayland/meta-wayland-touch.c
index 6d45b4b7b..37e1a611c 100644
--- a/src/wayland/meta-wayland-touch.c
+++ b/src/wayland/meta-wayland-touch.c
@@ -553,6 +553,25 @@ meta_wayland_touch_can_popup (MetaWaylandTouch *touch,
   return FALSE;
 }
 
+static gboolean
+touch_can_grab_surface (MetaWaylandTouchInfo *touch_info,
+                        MetaWaylandSurface   *surface)
+{
+  MetaWaylandSurface *subsurface;
+
+  if (touch_info->touch_surface->surface == surface)
+    return TRUE;
+
+  META_WAYLAND_SURFACE_FOREACH_SUBSURFACE (&surface->output_state,
+                                           subsurface)
+    {
+      if (touch_can_grab_surface (touch_info, subsurface))
+        return TRUE;
+    }
+
+  return FALSE;
+}
+
 ClutterEventSequence *
 meta_wayland_touch_find_grab_sequence (MetaWaylandTouch   *touch,
                                        MetaWaylandSurface *surface,
@@ -571,7 +590,7 @@ meta_wayland_touch_find_grab_sequence (MetaWaylandTouch   *touch,
                                  (gpointer*) &touch_info))
     {
       if (touch_info->slot_serial == serial &&
-	  touch_info->touch_surface->surface == surface)
+          touch_can_grab_surface (touch_info, surface))
         return sequence;
     }