no validation for prev button

As i see fapi introduces these issues since #required is checked by fapi.

Please add support for the solution at:
http://drupal.org/project/skip_validation

This won't be a dependency but much more a perfect integration if the module is present.

The only thing you need to do is add a single line to trigger the skip_validation process for the previous button.
See patch provided below.

Thanks

Sorry this patch was against a current cvs checkout... that was 6.x-3.x-dev ... right?
This should be fully working on all previous releases without any modifications.

Thanks quicksketch. I've tried something like comment 3 suggested without success. I might have done it wrong.
Finally i've found the solution provided.
Indeed fapi should provide something like that and skip_validation is a great transparent and minimalistic (but pretty expensive) workaround for all form clients...

Now if #266287 works it seems to be much more simple without requiring any further contrib. So for the moment (if it works) i'd prefer the form_set_error approach.
Whereas i'd expect to move it towards something like i suggested as soon as fapi supports it (D7 ...).

Please consider yourself which is the better solution. I'm happy to review as soon as provided.