switch channel This was caused by a typo, which would end up toggling the expanded status of the Grease Pencil datablock (gpd->flag & 4) instead of the layer active status (gpl->flag & 4).
switch channel This was caused by a typo, which would end up toggling the expanded status of the Grease Pencil datablock (gpd->flag & 4) instead of the layer active status (gpl->flag & 4).