Fix incorrect keyboard shortcut actions in popups #459
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NOTE: This PR covers the half of what still remains after #440 was closed.
When using keyboard shortcuts in popups an incorrect value is often returned from poll(), causing the wrong action to be taken.
The problem is that an "active button index" is returned rather than the expected "absolute button index".
Refactored code to return the correct value in all situations.
Bug reproduction:
Navigate to a random file you want to delete
Hit Enter
Select "Delete"
When you get the "Are you sure?" question pop, press the "Y" key on the keyboard - and you will see the file NOT being deleted
Try again, but press the "N" key, and the file WILL (incorrectly) be deleted