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If an atlas texture's last reference is held by the journal or by the last flushed pipeline then if an atlas migration is started it can cause a crash. This is because the atlas migration will cause a journal flush and can sometimes change the current pipeline which means that the texture would be destroyed during migration. This patch adds an extra 'post_reorganize' callback to the existing 'reorganize' callback (which is now renamed to 'pre_reorganize'). The pre_reorganize callback is now called before the atlas grabs a list of the current textures instead of after so that it doesn't matter if the journal flush destroys some of those textures. The pre_reorganize callback for CoglAtlasTexture grabs a reference to all of the textures so that they can not be destroyed when the migration changes the pipeline. In the post_reorganize callback the reference is removed again. http://bugzilla.clutter-project.org/show_bug.cgi?id=2538