Re: [editing] How do we switch the caret between overtype and insert mode? (#55)

(Sorry, I know that most keyboards still have an ins key and that MacOS is actually a niche product. I'm just not sure that ins is a commonly used key any more).

So we have the event requesting overtype...
If people try to set overtype, it should either work or tell the user it doesn't, rather than silently failing. Although I can see why implementations might prefer to silently fail.
I think those two things are why we need to mention overtype

The most obvious way I can think of to handle the interaction seems to be that you select a character, when a character is typed it replaces that one and the next character is selected... that re-uses what we do in typing, provides a visual indicator that uses platform hooks which should be easier to make accessible than doing everything ourselves, … But of course it's vapourware in my head, not a working implementation.

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