Sybren A. Stüvel
ba26adee0c
`ANIM_animdata_update()` did not sort grease pencil frames. A pre-existing comment stated this wouldn't be necessary as `posttrans_gpd_clean()` already does this. However, this is only applicable when the change is performed via the transform system. The mirror operator doesn't call `posttrans_gpd_clean()`, invalidating the assumption in the comment. I moved the sorting code into `BKE_gpencil_layer_frames_sort()`, which is now called from both `ANIM_animdata_update()` and `posttrans_gpd_clean()`.