ButtonRebindsFilter: Support keyboard modifiers with mouse buttons
This is needed to better support emitting mouse button events when pressing tablet buttons. It's common in many art programs that an action is tied to a mouse button + a modifier, such as panning the canvas. So being able to send keyboard modifiers in tandem with mouse buttons is very useful when rebinding.
Context: plasma-desktop!2384 (merged)
Blocked on
!6092 (merged)!6149 (merged) for places to add the relevant tests
Edited by Joshua Goins