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We currently rely only on MetaWindowActor to update the mask texture. This isn't good enough since we might get asked to use the mask (e.g. via meta_shaped_texture_get_image() ) after having a new texture size but before MetaWindowActor decides to update the mask in which case we might crash since cogl_texture_new_from_sub_texture() might fail with an early return such as Cogl-CRITICAL **: cogl_sub_texture_new: assertion 'sub_x + sub_width <= next_width' failed https://bugzilla.gnome.org/show_bug.cgi?id=762639
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