[gtk/4.0-backports: 18/53] wayland: Signal gtk-shell surface destruction to the server

[Matthias Clasen <matthiasc src gnome org>]

commit 08b1d2b897cef5de6844103518952c58737feafc
Author: Sebastian Keller <skeller gnome org>
Date:   Thu Jan 28 22:31:03 2021 +0100

    wayland: Signal gtk-shell surface destruction to the server
    
    This adds a "release" destructor for the gtk_surface1 interface which
    signals to the server that a surface has been destroyed on the client
    side, which the current "destroy" does not do.
    
    Ideally the protocol would have specified a destroy request marked as
    destructor to handle this automatically, however this is no longer
    possible due to the destroy method being implicitly generated in the
    absence of an explicit request in the protocol. Adding a destroy request
    marked as destructor now would generate a new destroy method that
    unconditionally would send the request to the server, which would break
    clients running on servers not supporting that request.

 gdk/wayland/gdkdisplay-wayland.c   | 2 +-
 gdk/wayland/gdksurface-wayland.c   | 6 +++++-
 gdk/wayland/protocol/gtk-shell.xml | 7 +++++--
 3 files changed, 11 insertions(+), 4 deletions(-)
---
diff --git a/gdk/wayland/gdkdisplay-wayland.c b/gdk/wayland/gdkdisplay-wayland.c
index 3acc10ed50..b261c77fae 100644
--- a/gdk/wayland/gdkdisplay-wayland.c
+++ b/gdk/wayland/gdkdisplay-wayland.c
@@ -94,7 +94,7 @@
 
 #define MIN_SYSTEM_BELL_DELAY_MS 20
 
-#define GTK_SHELL1_VERSION       3
+#define GTK_SHELL1_VERSION       4
 #define OUTPUT_VERSION_WITH_DONE 2
 #define NO_XDG_OUTPUT_DONE_SINCE_VERSION 3
 
diff --git a/gdk/wayland/gdksurface-wayland.c b/gdk/wayland/gdksurface-wayland.c
index 0fd1b82a9b..d31e4ae6ee 100644
--- a/gdk/wayland/gdksurface-wayland.c
+++ b/gdk/wayland/gdksurface-wayland.c
@@ -2967,7 +2967,11 @@ gdk_wayland_surface_hide_surface (GdkSurface *surface)
 
       if (impl->display_server.gtk_surface)
         {
-          gtk_surface1_destroy (impl->display_server.gtk_surface);
+          if (display_wayland->gtk_shell_version >=
+              GTK_SURFACE1_RELEASE_SINCE_VERSION)
+            gtk_surface1_release (impl->display_server.gtk_surface);
+          else
+            gtk_surface1_destroy (impl->display_server.gtk_surface);
           impl->display_server.gtk_surface = NULL;
           impl->application.was_set = FALSE;
         }
diff --git a/gdk/wayland/protocol/gtk-shell.xml b/gdk/wayland/protocol/gtk-shell.xml
index fb91940b30..1aab593c42 100644
--- a/gdk/wayland/protocol/gtk-shell.xml
+++ b/gdk/wayland/protocol/gtk-shell.xml
@@ -1,6 +1,6 @@
 <protocol name="gtk">
 
-  <interface name="gtk_shell1" version="3">
+  <interface name="gtk_shell1" version="4">
     <description summary="gtk specific extensions">
       gtk_shell is a protocol extension providing additional features for
       clients implementing it.
@@ -35,7 +35,7 @@
     </request>
   </interface>
 
-  <interface name="gtk_surface1" version="3">
+  <interface name="gtk_surface1" version="4">
     <request name="set_dbus_properties">
       <arg name="application_id" type="string" allow-null="true"/>
       <arg name="app_menu_path" type="string" allow-null="true"/>
@@ -82,6 +82,9 @@
     <request name="request_focus" since="3">
       <arg name="startup_id" type="string" allow-null="true"/>
     </request>
+
+    <!-- Version 4 additions -->
+    <request name="release" type="destructor" since="4"/>
   </interface>
 
 </protocol>