Forgive me for what may be a naive question, since I'm not familiar with the codebase, but regarding:

Let me suggest a possible algorithm:

I'd really like to see this implemented. It's especially annoying in combination with T217914. If I mis-tap on my tablet, my desktop gets logged out too. I also have 2FA enabled, so it's doubly annoying. And, if I don't have my phone with me (or it's broken, etc), in a single errant finger-tap, I've inflicted a DOS attack on myself across my multiple devices.

Requiring confirmation to logout should be available, even if it's just an option you can set in preferences. On a mobile device, it just takes an errant finger tap to log you out, and that happens fairly frequently.

PS:
Chrome Version 70.0.3538.110 (Official Build) (64-bit)
MacOS 10.13.6 (17G3025)
https://en.wikipedia.org/w/index.php?title=User:RoySmith/sandbox&oldid=873327421

There is a related discussion at https://wm-bot.wmflabs.org/logs/%23wikimedia-tech/20181128.txt

Please see https://en.wikipedia.org/w/index.php?title=Wikipedia:Village_pump_(proposals)&oldid=871029729#Diffs_should_include_log_extracts for a current discussion about this.

Oh, wait, it's even weirder than that. See the third screenshot:

Just to clarify, the references get renumbered in the body text, but they retain the original numbering in the reflist. This makes it really confusing to edit the references.

I'm not sure I'm parsing your question right, but there are certainly instances where I tap on a piece of text and the insertion point appears there without the magnify box ever appearing. And, in those cases, I never see the insertion point jump to a new location.

BTW, I can reproduce this with both wikilinks (double brackets) and external links (single brackets).

No, it does not happen in demo you linked to.

If I see it again, I'll try to repro it with safe mode.

Oooops, accidentally created as a duplicate of T197592

I think I just figured out part of it. I never noticed this before, but I'm guessing the "More" tab is a general-purpose overflow menu, for all items that didn't fit onto the tab bar?

I'm using:

Adding "&safemode=1" to the URL has no effect.