The "primary button" is used at many places, but sometimes they might
conflict (due to button switch, hidden panel, dropdown menu, etc).
Sometimes we could add a special CSS class for the buttons, but
sometimes not (see the comment of QuickSubmit)
This PR introduces `querySingleVisibleElem` to help to get the correct
primary button (the only visible one), and prevent from querying the
wrong buttons.
Fix #32437
---------
Co-authored-by: silverwind <me@silverwind.io>
None of the frontend js/ts files was touched besides these two commands
(edit: no longer true, I touched one file in
61105d0618
because of a deprecation that was not showing before the rename).
`tsc` currently reports 778 errors, so I have disabled it in CI as
planned.
Everything appears to work fine.
