[Wayland-bugs] [Bug 725172] GdkWindow: fix redraws for backends that keep the same backing cairo surface

[gtk+ (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725172
  gtk+ | Backend: Wayland | unspecified

--- Comment #2 from Giovanni Campagna <scampa.giovanni at gmail.com> 2014-02-25 21:25:37 UTC ---
Created an attachment (id=270327)
 View: https://bugzilla.gnome.org/attachment.cgi?id=270327
 Review: https://bugzilla.gnome.org/review?bug=725172&attachment=270327

GdkWindow: fix redraws for backends that keep the same backing cairo surface

If gdk_window_create_cairo_surface() returns a surface that was
already used in the past as cairo surface (as it happens for
toplevel gdkwayland windows, whose cairo surface is the shm
image), setting a user data calls the destructor for the existing
user data, which clears window->cairo_surface, effectively nullifying
the effect of ref_cairo_surface(), which then returns NULL.

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