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87f99e214a
Previously we would call _cogl_material_pre_change_notify unconditionally, but now we wait until we really know we are removing a layer before notifying the change, which will require a journal flush. Since the convenience functions cogl_set_source_color4ub and cogl_set_source_texture share a single material, cogl_set_source_color4ub always calls cogl_material_remove_layer. Often this is a NOP though and shouldn't require a journal flush. This gets performance back to where it was before reverting the per-actor material commits.