[Wayland-bugs] [Bug 775470] New: GdkWindow does not always unref all GdkFrameClockIdle it creates

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775470

            Bug ID: 775470
           Summary: GdkWindow does not always unref all GdkFrameClockIdle
                    it creates
    Classification: Platform
           Product: gtk+
           Version: 3.22.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: sixtysix at inwind.it
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

After setting GOBJECT_DEBUG=objects comparing the outputs
of the following program run with ITERATIONS set to 2 and 1:

#include <gtk/gtk.h>

#ifndef ITERATIONS
#define ITERATIONS 1
#endif

int
main (int   argc,
      char *argv[])
{
  if (gtk_init_check (&argc, &argv))
    {
      int i;
      for (i = 0; i < ITERATIONS; ++i)
        {
          GtkWidget *dialog;
          dialog = gtk_file_chooser_dialog_new ("Open File",
                                                NULL,
                                                GTK_FILE_CHOOSER_ACTION_OPEN,
                                                "Cancel", GTK_RESPONSE_CANCEL,
                                                NULL);
          gtk_widget_show_all (dialog);
          gtk_widget_destroy (dialog);
        }
    }

  return 0;
}

on Wayland the number of objects alive at exit increases for the 
presence of few GdkFrameClockIdle objects.

The problem is that on Wayland popover GdkWindow have window_type
GDK_WINDOW_SUBSURFACE

https://git.gnome.org/browse/gtk+/tree/gtk/gtkwindow.c?h=gtk-3-22#n6647

and gdk_window_destroy (_gdk_window_destroy_hierarchy) does nearly nothing
for this kind of GdkWindow:

https://git.gnome.org/browse/gtk+/tree/gdk/gdkwindow.c?h=gtk-3-22#n2019

in particular it does not unref GdkFrameClockIdle objects it
creates.

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