michael.cadilhac@lrde.org (Michaėl Cadilhac) writes:

> M-x  tabify has  an unexpected  behavior with  files that  are already
> tabified: once it is called, the  file is set to be modified. In fact,
> the regions of spaces are removed and then re-added.
>
> Can the following patch be applied to change this behavior?
>
> It checks that the region we are going to delete is not already of the
> form « tabs then spaces less than a tab. ».

... Sorry for the noise, the previous patch was no good.  Please
consider the following one.