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Bastien Montagne c08924bf94 Rework library_query foreach looper - add optional recursivity.

This commit:
* Fixes bad handling of 'stop iteration' (by adding a status flag, so that we can actually
  stop in helper functions too, and jumping to a finalize label instead of raw return, to
  allow propper clean up).
* Adds optional recursion into 'ID tree' - callback can also decide to exclude current id_pp
  from recursion. Note that this implies 'readonly', modifying IDs while recursing is not
  something we want to support!
* Changes callback signature/expected behavior: return behavior is now handled through flags,
  and 'parent' ID of id_pp is also passed (since it may not always be root id anymore).

Reviewers: sergey, campbellbarton

Differential Revision: https://developer.blender.org/D1869

2016-03-24 16:10:39 +01:00