Steps to reproduce:

1. Open the Options dialog
2. Go to the Custom Actions tab
3. Double-click an existing custom action item to open the edit dialog
4. Click the Cancel button

Result:

• The edit dialog immediately reappears after clicking the Cancel button.

Expected:

• The edit dialog should not reappear after clicking the Cancel button.

Note:

• If you click the Edit button instead of double-clicking the list item in order to open custom action edit dialog, this behavior is not triggered. That is, the Cancel button does not cause the dialog to reappear if the dialog was opened by clicking the Edit button.

This GIF shows shows reproduction of the bug: https://interworks.box.com/s/l0ar6wrgono8mcbo8a0qomrljc6dwoza