'Goto' dialog breaks keyboard support?

After using the 'goto' dialog to view a different image in the list, all keyboard actions stop working. I.e. it is no longer possible to view "next image" with the right-arrow, page-down, etc.

This issue is intermittent. Sometimes happens immediately, sometimes multiple uses of the 'goto' dialog is required.

Observed multiple times on KDE, possibly not on Linux Mint Cinnamon.

Start by reproducing the intermittent failure after using the Goto dialog, comparing KDE with Linux Mint Cinnamon as reported. Trace the Goto dialog and the handlers for next-image keyboard actions, then verify that right-arrow and Page Down continue working after repeated dialog use on the affected platforms.

Written by the indexing model from the issue text.