Re: CC mode 5.31.4: c-{beginning, end}-of-defun try to modify buffer

[Lennart Borgman (gmail)]

Alan Mackenzie wrote:
> Hi, Andreas!
>
> On Tue, Jan 08, 2008 at 06:13:40PM +0100, Andreas Schwab wrote:
> > c-{beginning,end}-of-defun try to modify the buffer and thus trigger
> > ask-user-about-supersession-threat.  To reproduce load a C file and
> > touch the underlying file.  Then type C-M-e repeatedly.  After some
> > tries you will be asked whether you want to edit the buffer.
>
> Ouch!
>
> Yes, I can reproduce this.  At a guess, it's happening because of CC
> Mode's extensive use of text properties.  I don't (yet) see why it only
> happens after a several C-M-e's rather than the first.  Applying text
> properties counts as modifying the buffer (I think this is a Bad Thing),
> and the primitive function which applies the text properties seems to be
> checking for the file having been modified.  Or something like that.

Are you talking about the text properties that font lock applies? I 
believe those does not mark the buffer as modified.