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.
12e703414d modifiers: make a new abstraction for momentary-click, instead of button_2 (lib part)
libs/gtkmm2ext/gtkmm2ext/keyboard.h | 2 ++
libs/gtkmm2ext/keyboard.cc | 10 ++++++++++
2 files changed, 12 insertions(+)