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bug#22296: 25.1.50; Document changes to `delete-selection-mode'
From: |
Drew Adams |
Subject: |
bug#22296: 25.1.50; Document changes to `delete-selection-mode' |
Date: |
Sun, 3 Jan 2016 08:24:35 -0800 (PST) |
> I looked at delsel.el, and the only user-visible change in behavior
> since v24.3 is the one that was already announced in NEWS.24:
>
> ** Delete Selection mode can now be used without Transient Mark mode.
Somehow I didn't notice that mention.
> If you know about other changes (that are not bugfixes), please name
> them.
Frankly, I do not understand all of the changes I see in the code
since 24.3. There are a boatload of them. `diff' the Emacs 25
version against the 24.3 version.
1. It "can now be used without transient mark mode" is misleading.
You could always turn off t-m-mode (after turning d-s-mode on)
and still use d-s-mode. (But you might have been surprised to see
stuff disappear because you didn't notice what was in the region.)
The changes for this seem to be: (1) d-s-mode does not automatically
turn on t-m-mode now, and (2) d-s-mode does NOT have any effect unless
you turn on t-m-mode temporarily. IOW, d-s-mode works now only with
temporary t-m-mode; it no longer works with a non-active region.
(And yes, this is a good change.)
2. d-s-mode now supports rectangular regions (?). Not clear
to me what this is about, from a quick glance at the code.
Maybe you will characterize this as a bug fix, but the behavior
seems to be changed, in any case.
3. Command `delete-selection-repeat-replace-region' was added.
It seems to be bound, so far, only in CUA mode (to `M-v').
Not real clear to me what this is about/for.
4. Apparently you can no longer specify `kill' as the d-s behavior:
(put 'some-command 'delete-selection 'kill). Well, it's still
supported for now, but `kill' has been removed from the file-header
Commentary, and the code comments say that it is deprecated.
Why is this? Where is this deprecation documented? Why
shouldn't a user or a library still be able to override a
`delete-selection' setting for a given command, to specify
it as `kill'? Not clear to me what this is about.
5. There is an additional, undocumented (why?) possible value
for `delete-selection', which you can apparently put on a
command's symbol: `delete-selection-uses-region-p'. Please
consider documenting this (e.g., not just mentioning it in NEWS).
6. The default delete-selection behavior for multiple commands
has apparently changed. For example, `open-line' now has the
default behavior and not the `kill' behavior. Likewise, unloading
(`delsel-unload-function') deals with a different command list.
Those are a start - things I see that I wonder about. You may
others, or you may understand these things better or differently.
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Drew Adams, 2016/01/02
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Eli Zaretskii, 2016/01/03
- bug#22296: 25.1.50; Document changes to `delete-selection-mode',
Drew Adams <=
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Eli Zaretskii, 2016/01/03
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Drew Adams, 2016/01/03
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Eli Zaretskii, 2016/01/03
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Drew Adams, 2016/01/03
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Eli Zaretskii, 2016/01/03
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Drew Adams, 2016/01/03
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Eli Zaretskii, 2016/01/08
- bug#22296: 25.1.50; Document changes to `delete-selection-mode', Drew Adams, 2016/01/08