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bug#6871: Please make linum-mode per buffer, not per major mode

From: Lennart Borgman
Subject: bug#6871: Please make linum-mode per buffer, not per major mode
Date: Tue, 17 Aug 2010 14:35:19 +0200

On Tue, Aug 17, 2010 at 2:11 PM, Stefan Monnier
<address@hidden> wrote:
>>>> Line numbers should work even in multi major mode buffers. Please add
>>>> the following lines to linum.el:
>>>> (put 'linum-overlays  'permanent-local t)
>>>> (put 'linum-available 'permanent-local t)
>>>> (put 'linum-mode      'permanent-local t)
>>> I don't think that's going to be sufficient: you'll probably at least
>>> also want to remove the
>>>        (add-hook 'change-major-mode-hook 'linum-delete-overlays nil t)
>>> I.e. you can't just make some vars permanent-local, you have to adjust
>>> the major mode from "mode-specific" to "permanent-local".
>> Yes, I know. I have added code to take careof this for linum in
>> mumamo.el. But we do not yet have code in Emacs for taking care of
>> this more generally.
> But your report is about fixing it in linum.el (where it belongs), which
> means to turn linum-mode from a major-mode-specific minor-mode to
> a permanent-local major-mode.  I think such a change is acceptable
> (although the motivation of multi-major-mode buffers might not be that
> compelling, since it tends to lead to the idea that most/all
> minor-modes should be made permanent-local), but we need a proper patch
> for it.

How about also removing adding linum to change-major-mode-hook?

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