Re: [RFC PATCH] mergetools/vimdiff: add vimdiff4 merge tool variant

Fernando Ramos [off-list ref] writes:

The nice thing about this approach is that, as we have seen, it is generic
enough to rule all current variants obsolete.

I am not a vimdiff user (or mergetools in general---I should use it
as appropriately from time to time myself), but it would be great if
such a general "layout rule language" can be used to replicate the
existing variants.

So, please let me know what you think about this:

  * Do you like this approach? Or am I trying to crack a nut with a sledgehammer
    by making the whole thing too complex?

  * In case you like it, should we keep the old "vimdiff1", "vimdiff2" and
    "vimdiff3" variants for backwards compatibility?
    If the answer is "yes", I'll just alias them to the new "layout" mechanism
    so that the amount of extra code needed for supporting them is minimal.

It is great that the new "description based layout" can replicate
the existing variants, and it is natural migration path to redo the
existing variants with the new mechanism once the dust settles as a
separate step.  The end-users should be able to rely on their
existing configuration to keep working the same way as they are used
to.

Thanks.