[recipes] Defer unexporting handles to an idle

[Matthias Clasen <matthiasc src gnome org>]

commit d113e5353fe855289378fb827f67c9a59efddcb6
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Mar 3 13:25:45 2017 -0500

    Defer unexporting handles to an idle
    
    We were seeing unexpected effects when calling
    gdk_window_unexport_handle out of the export_handle
    callback. Avoid that by deferring the unexport
    to an idle. This is really just a workaround for
    deficiencies in the handle export API.

 src/gr-utils.c |   33 +++++++++++++++++++++++++--------
 1 files changed, 25 insertions(+), 8 deletions(-)
---
diff --git a/src/gr-utils.c b/src/gr-utils.c
index 62d0d41..640c8dc 100644
--- a/src/gr-utils.c
+++ b/src/gr-utils.c
@@ -479,23 +479,40 @@ all_headers (GtkListBoxRow *row,
 #ifdef GDK_WINDOWING_WAYLAND
 typedef struct {
         GtkWindow *window;
+        char *handle_str;
         WindowHandleExported callback;
         gpointer user_data;
 } WaylandWindowHandleExportedData;
 
 static void
+free_exported_data (gpointer data)
+{
+        WaylandWindowHandleExportedData *d = data;
+
+        g_free (d->handle_str);
+        g_free (d);
+}
+
+static gboolean
+handle_exported_idle (gpointer user_data)
+{
+        WaylandWindowHandleExportedData *data = user_data;
+
+        data->callback (data->window, data->handle_str, data->user_data);
+        free_exported_data (data);
+
+        return G_SOURCE_REMOVE;
+}
+
+static void
 wayland_window_handle_exported (GdkWindow  *window,
                                 const char *wayland_handle_str,
                                 gpointer    user_data)
 {
         WaylandWindowHandleExportedData *data = user_data;
-        char *handle_str;
-
-        handle_str = g_strdup_printf ("wayland:%s", wayland_handle_str);
-        data->callback (data->window, handle_str, data->user_data);
-        g_free (handle_str);
 
-        g_free (data);
+        data->handle_str = g_strdup_printf ("wayland:%s", wayland_handle_str);
+        g_idle_add (handle_exported_idle, data);
 }
 #endif
 
@@ -529,8 +546,8 @@ window_export_handle (GtkWindow            *window,
                 if (!gdk_wayland_window_export_handle (gdk_window,
                                                        wayland_window_handle_exported,
                                                        data,
-                                                       g_free)) {
-                        g_free (data);
+                                                       free_exported_data)) {
+                        free_exported_data (data);
                         return FALSE;
                 }
                 else {