settings_ui: Ensure selected keymap entry is properly updated (#34229)

This change ensures that we more reliably deploy the context menu in the
keymap editor as well as highlight the selected row quicker.

Release Notes:

- N/A
d6bff274ebFinn Evers committed on 7/10/2025, 5:49:52 PM· committed by GitHubparentcfc9cfa
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