Putting `mark' before S and `point' after T highlights the entire
overlay but not its after-string.
That in itself might be ok.
Placing `mark' after T and `point'
after the character following T does not highlight a single character of
O but does highlight the after-string. This is counterintuitive.
That is clearly a bug.
Moreover, A inherits face properties from the character displayed after
A and not from the last character of the overlay. Counterintuitive too.
I don't see why A inherits any properties from characters either before
or after it. That seems like a bug.
Normally when we speak of inheriting text properties we mean that you
insert character C and it gets properties from an adjacent character
D. But that doesn't happen here, does it? Do you actually mean
that the text of A is displayed in a way controlled by the properties
of the following character?
That seems to be simply a bug. So I think we don't need to look
for adding some kind of new features, some kind of "barriers".
We just need to fix the bug.
that is, the before-string is displayed twice with the cursor after the
second incarnation. Redisplay removes the double.
That is also simply a bug.
You've found an awful lot of bugs. Thank you.
Now we have to try to fix them, which won't be easy.
But at least we have the possibility to try.
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