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Re: How to determine buffer change

From: Thorsten Jolitz
Subject: Re: How to determine buffer change
Date: Sat, 05 Apr 2014 16:54:28 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>>> in a program I insert text in an empty temporary edit-buffer, what of
>>> course modifies the `buffer-undo-list'.
>>> Assume that at this moment (lets call it time T1)
>>> ,------------------------------
>>> | M-: (length buffer-undo-list)
>>> `------------------------------
>>> returns 9. 
>>> Now when there are changes to the text in the edit-buffer, these are
>>> copied to the original buffer after quitting. But when nothing has
>>> changed after the insertion of the original text, it would be better to
>>> simply discard the edit-buffer and not touch the original buffer at
>>> all. 
>>> I could remember the length of the buffer-undo-list at time T1 and then
>>> check if it changed when quitting, but this does not seem very robust,
>>> since this length grows and shrinks in both directions.
>> Did you try using buffer-modified-tick?

> set buffer-undo-list to nil (after all, so you really want the user to
> be able to un-insert the initial text?).

No, I don't, and the simplest solutions are often the best but don't
come to ones mind first. That works like a charm, thanks. 


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