Rule file picker does not submit selected file on "Enter" key press


After pressing "Enter" key in rule picker dialog window, corresponding rule file path does not appear in the "rule" field. Otherwise, after clicking on "ok" submit button in the rule picker window, path to the rule file appears correctly.

Steps to reproduce:
1. Open Motif transformation
2. Create any rule
3. Open rule editor dialog window
4. Click "..." to open rule picker window to choose rule file
5. Click on desired rule file to highlight it
6. Press "Enter" key
7. Rule picker window closes and "rule" field remains empty (untouched)

Reproduce the issue through Motif transformation, the rule editor dialog, and its rule picker: select a rule file, press Enter, and compare the result with clicking OK. Locate the rule picker’s keyboard-submit handling and make the selected path populate the rule field on Enter, then repeat the reproduction steps to verify both submission paths.

Written by the indexing model from the issue text.