an application where you'd like it to work the other way around?
is it incompatible with That Other Emacs?
Not particularly. I've been trying to understand the interaction
between the "little dance" vm does when it updates summary entries,
and the extents I'm putting on top of them. (It's taken me 11 years to
get this right.)
But now I understand that it works because I'm resetting my extents
at every possible opportunity, rather than because of any cunning
I suppose the general case I have in mind is where you have two extents
covering adjacent fields:
and if point is at the first y, there's a clear distinction between
adding to the end of field x, and adding to the beginning of field y.
If you were using markers to track the fields (as vm does), then
insert-before-markers and insert are the way you'd do it. But with
extents would the only possibility be to change the openness each
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