This PR may fix #2287, at least partially, or in a transitional way. It's a two-line code change, and all it does is ensure that on mobile, overflow can be scrolled.

This is not a good solution for desktop, of course, where the scrollbar when visible (as it is on nearly all computers) would not only cover content and be ugly, but scrolling horizontally is generally not a good experience. However on mobile, the scrollbar fades in briefly when you load the page, and you can just drag with your finger.

Let's discuss whether this is a good solution.

Demo:

Here's how the Android app does it: https://cloudup.com/c9O9cRkfx0K

Merging because the tests pass, it's a trivial change, and I got a thumbs up in chat!

Right, the only way I can see to make the drop-down menu work again is to set the position using Javascript.

Because it relied on being able to position relative to the button and now the button does not allow any overflow. The only reason the block switcher still works is that it always ignored the position of the button when displaying the drop-down.

Going to try something, I have an idea.