Path command number fields get unfocused when the cursor moves outside of their horizontal strip

[MewPurPur]

This is a regression from the combination of two pull requests:

1. The optimization to path command editors to use a single control to draw the whole thing
2. The rework to BetterLineEdit that made them no longer pause the tree when focused.

Now when you've focused a BetterLineEdit, you can still hover other fields, but the path field only holds one active index, because before the tree was paused until you finished.