I am reworking my FastScale addon for 2.80, and would like to add my tool to the left toolbar as a subtool of the Scale tool (using the same icon). Can anyone point me into the right direction?
EDIT : I just finished porting the addon to 2.80, but with button in its own panel, like in 2.7x version. Still wondering how to register as an active tool and appear in the toolbar…
EDIT : I am doing more research; it seems to be propably impossible, can someone confirm this?