Re: [Orgmode] table refresh: when should the buffer be marked modified?

[Carsten Dominik]

On Jun 21, 2009, at 11:34 AM, Michael Brand wrote:

> I was not able to find a description about buffer modification after  
> a table refresh.

A table refresh always *does* modify the buffer, even if the resulting  
buffer is the same.

You have observed correctly that I am by-passing this when aligning  
all tables on startup,
but I don't think I want to check this each time a table is being  
aligned, this would
cause overhead.

If you really want this, you could use advice on org-table-align,  
temporarily binding inhibit-read-only,
storing the value of buffer-modified-flag, doing the alignment and  
then restoring the value of
buffer-modified-flag.  SOmething like

   (let ((inhibit-read-only t))
     (org-unmodified ad-do-it) .....

What are the practical situations when you are reading read-only files  
in Org-mode?
Maybe you can change this?

HTH

- Carsten


> When a table gets a refresh like after C-c C-c or moving around with  
> Tab the buffer is marked modified also when no change for  
> realignment of the table grid is necessary. Is this an  
> implementation limitation for simplification? If yes my vote for  
> which of the features to be next would be that during a table  
> refresh there is a check if an automatic realignment changed the  
> table grid. If the buffer's file does not need an update I would  
> like the buffer to remain not modified. Beside other advantages it  
> would make it possible to narrow columns in read-only buffers which  
> are not narrowed before for any reason and I am not sure if it would  
> eventually help me with multiple undo in tables which confused me  
> sometimes.
>
> My opposite finding is that - interestingly only with org-startup- 
> align-all-tables t ! - when I open a file with a misaligned table  
> not in org-mode and then invoke org-mode the table gets aligned but  
> the buffer does not get modified. I expected it modified, org-mode  
> version is 6.27a.
>
>
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