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bug#34764: prettify-symbols-mode pollutes font-lock-extra-keywords
From: |
Drew Adams |
Subject: |
bug#34764: prettify-symbols-mode pollutes font-lock-extra-keywords |
Date: |
Tue, 5 Mar 2019 22:23:06 -0800 (PST) |
> > Typically, I use a library-specific property instead
> > (e.g. `my-composition') and do whatever is needed to
> > give that property an effect like the general (global)
> > property, without interfering with that general property.
>
> I never thought about this solution. This is great actually! I'm
> aware of char-property-alias-alist, but I never quite realized that it
> provided an elegant solution to the problem of restoring font-lock-
> extra-managed-props when disabling a minor mode (the only user in the
> emacs source tree seems to befont-lock). Is that the mechanism you had
> in mind?
No, in fact I wasn't aware of `char-property-alias-alist'. ;-)
I just meant in some way to try to have a library-specific
property control or replace a general property. I don't
have in mind a general mechanism for doing that.
> > Maybe that's not appropriate for prettify-*. Dunno.
> >
> > Or I keep track of the initial state before adding
> > `composition', and then reset that property only if it
> > wasn't used to begin with (i.e., restore its value).
> >
> > But that's not foolproof either, since some other code
> > can affect things after prettify-* is turned on, so
> > restoring to the state before it was turned on isn't
> > necessarily TRT.
> >
> > Maybe such a save/restore approach is not easy/possible
> > for prettify-*. Dunno.
>
> Right, I think that approach is doomed, because modes are not enable
> and disabled in a well-parenthesized manner (you can enable A, enable
> B, disable A, and disable B)
Yes. But it kinda depends on how "big", longlasting or
important a (minor) mode is. If it's something that
you tend to leave on a lot, as a basic Emacs customization
then you can sometimes live with just restoring the
previously ~virgin state when you toggle it off briefly.
But yeah, it depends.
> Thanks for the cool idea about char-property-alias-alist!
It was your idea! Let us know how you make do with it.