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bug#53294: 29.0.50; Indirect font changes incorrectly affecting original
From: |
Stefan Monnier |
Subject: |
bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer |
Date: |
Sun, 16 Jan 2022 12:11:39 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
>> > But "inheriting" the state means the indirect buffer gets the
>> > copy of the variables of the original buffer, and that is not a
>> > deep copy, AFAIU.
>> > Stefan, any comments on this issue?
>> Sorry, I may have been unclear. I'm not disagreeing - what you
>> just said is correct. But, because of that, it's a bug for code to
>> make an indirect buffer, then perform operations on it via setcdr
>> or setf like things, which then will affect the original buffer's
>> variables.
> I'm not sure it's a bug. It could be a "feature", not limited to
> face-remapping-alist, but instead affecting every buffer-local
> variable that is not a simple scalar.
`make-indirect-buffer` can't do the right thing, indeed, because
different variables need different handling. `clone-buffer` tries to
handle these issues by relying on `clone-buffer-hook` to handle the
various variables on a case-by-case basis, but `make-indirect-buffer`
doesn't come with such a hook.
Some ways we can fix this:
- In `face-remap.el`, refrain from modifying the `face-remapping-alist`
by side-effects (i.e. avoid `delq`, `setcdr`, and friends).
- Add a `make-indirect-buffer-hook` and arrange for `face-remap.el` to
add a function there that does a deep enough copy of
`face-remapping-alist`.
- Remember that indirect buffers are an attractive nuisance and should
be deprecated (but note that I suspect the same bug affects
`clone-buffer` because it doesn't make a deep enough copy of
`face-remapping-alist` either).
Stefan
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Andrew Hyatt, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Eli Zaretskii, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Andrew Hyatt, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Eli Zaretskii, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Andrew Hyatt, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Eli Zaretskii, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer,
Stefan Monnier <=
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Eli Zaretskii, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Andrew Hyatt, 2022/01/16
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Stefan Monnier, 2022/01/17
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Andrew Hyatt, 2022/01/17
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Stefan Monnier, 2022/01/17
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Andrew Hyatt, 2022/01/18
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Stefan Monnier, 2022/01/18
- bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer, Lars Ingebrigtsen, 2022/01/20