12e703414d
is_button2_event() was used to detect the user's desire for a momentary-click on some buttons (mute, solo, mixer scenes) is_momentary_push_event() disambiguates this action from is_button2_event() for the special case of momentary, we can drop the workarounds for the lack of middle-mouse buttons on Mac, and instead just use shift+left-click on all platforms.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html