recorder/KKeySequenceRecorderPrivate: support recording multi-key modifier-only shortcuts
Multi-key modifier-only shortcuts are registered if all modifiers are released within a short interval. Pretty display the sequence in the form of Mods + Key, without repitition.
Supports plasma/kglobalacceld!44 (merged)
The plan is to not distinguish between left/right keys, as is currently implemented in kwin.
Edited by Yifan Zhu