version switcher AJAX not working on RTD

[drammock]

foo.webm

Expected behavior is that when a page doesn't exist for a specific docs version, we redirect to the homepage for that version. Seems like maybe the RTD "maze found" page is fooling our AJAX into thinking that a page does exist there? Except that once in a while, it does work as expected. I haven't figured out whether it's intermittent (some kind of race between our AJAX and RTD's maze-finding logic?) or systematic (only works on some pages / some versions).

[coretl]

This is not working for me either when the 404 page is on GitHub pages. I did a bit of digging, and found that
https://github.com/pydata/pydata-sphinx-theme/blob/main/src/pydata_sphinx_theme/assets/scripts/index.js#L327 is meant to install checkPageExistsAndRedirect as a click handler on item in the dropdown box, but putting a console.log() at the top of checkPageExistsAndRedirect showed it wasn't run. Inspecting in firefox shows a click handler on the top level drop down, but not the items. Inspecting in chrome shows many click handlers for each item, but it still doesn't fire checkPageExistsAndRedirect. At this point my javascript debugging skills fail me, so I'll leave it to someone who might know more about this...