3b0c23a1f2
`PROP_ICONS_CONSECUTIVE` is set for `use_onion_skinning` property with the help of `RNA_def_property_ui_icon`. In this case, `but->iconadd` will handle the other icon for "toggle" button types. So just use `ICON_ONIONSKIN_OFF` when drawing the onion skinning button in dopesheet. Resolves #121232 Pull Request: https://projects.blender.org/blender/blender/pulls/121254