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Each time a material property changes we look to see if any of its ancestry has become redundant and if so we prune that redundant ancestry. There was a problem with the logic that handles this though because we weren't considering that a material which is a layer state authority may still defer to ancestors to define the state of individual layers. For example a material that derives from a parent with 5 layers can become a STATE_LAYERS authority by simply changing it's ->n_layers count to 4 and in that case it can still defer to its ancestors to define the state of those 4 layers. This patch checks first if a material is a layer state authority and if so only tries to prune its ancestry if it also *owns* all the individual layers it depends on. (I.e. if g_list_length (material->layer_differences) != material->n_layers then it's not safe to try pruning its ancestry!) http://bugzilla-attachments.gnome.org/attachment.cgi?id=170907 |
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