Extend "Repeat previous chord" shortcut's behaviour to not reset when adding/selecting rests

Currently, you can press "R" button to repeat previous chord.
This doesn't work in cases where you write a chord, then you add a pause, then you repeat last chord. (see figure)
The shortcut itself seems to do nothing in this case, so this extension shouldn't create any conflict.
Possible implementation I feel to suggest: avoid resetting stored chord if the new selection is a rest.