[Zope-dev] OrderSupport: small improvement

[yuppie]

Hi!


Currently the OrderSupport API always orders sub-objects relative to the 
complete list of sub-objects. This causes problems if some hidden 
sub-objects are not shown.

 From an UI point of view, moving sub-objects should always be relative 
to the visible subset of sub-objects.

I'd like to add a new optional argument to moveObjectsByDelta (and the 
derived methods moveObjectsUp, moveObjectsDown, moveObjectsToTop, 
moveObjectsToBottom):

     subset_ids

This would be 100% backwards compatible and would allow to specify the 
visible subset of sub-objects.

     def moveObjectsByDelta(ids, delta, subset_ids=None):

If subset_ids is specified, delta will be interpreted relative to that 
subset.


If there are no objections I'll soon check in the necessary changes to 
Zope-2_7-branch and HEAD.

Cheers,
	Yuppie