702bc5ba26
Just store bones that could not get renamed to desired flipped name on the first try into a temp list, and try to rename them a second time. This is rather simple solution, will induce 'over numbering' in case you flip a bone to another unselected bone's name (since number will be incremented in both rename attempts), but think this is acceptable minor glitch, for a corner case situation that does not have any good resolution anyway. Also, set `strip_numbers` option of `BKE_deform_flip_side_name` to false, otherwise chains of bones with same names would get their numbers completely messed up after name flipping. Based on work by @dfelinto in D2456 (https://developer.blender.org/D2456), thanks.