`findMatch` should change next/prev direction according to if you pressed Enter (or shift+enter) in search box

# Description of the new feature/enhancement

`findMatch` has a direction associated with it. It should operate like this:
- if in search dialog you press Enter --> "findNext" should search in that direction (bottom-up), shift+f3 should search backwards
- if you press shift+enter --> "findNext" should go in that direction (top-down), shift+f3 should search backwards

NOTE:
- F3 --> "findMatch" dir:next
- Shift+f3 --> "findMatch" dir:prev

Start by tracing the search dialog's findMatch entry point and the existing F3 and Shift+F3 handling described in the issue. Verify how Enter and Shift+Enter select findNext direction, then confirm that F3 and Shift+F3 retain their documented next and previous behavior in the search dialog.

Written by the indexing model from the issue text.