runDialog: Require matching key-press for ESC shortcut

runDialog: Require matching key-press for ESC shortcut

Both popover menus and dialogs can be dismissed with the Escape key,
however the former triggers on key press, while the latter triggers
on key release. As a result, the same key press+release can dismiss
both the command entry's context menu and the run dialog itself.

Fix this by only triggering a key shortcut when a matching key press
was recorded before, which matches how Dialog handles button shortcuts.

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/8132
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3585>
(cherry picked from commit 9b9191e8585025eb038d08fa63227f46a4b22cb8)