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Bastien Montagne 133dde41bb Improve handling of (in)direclty linked status for linked IDs. ...

This commit essentially ensures before writing .blend file that only
actualy locally used linked IDs are tagged as `LIB_TAG_EXTERN` (and
therefore get a reference stored in the .blend file).

Previously, a linked ID tagged as directly linked would never get back
to the indirectly linked status. Consequence was a lot of 'needless'
references to linked data in .blend files.

This commit also introduces a new flag for lib_query ID usage types,
`IDWALK_CB_DIRECT_WEAK_LINK`, used currently for base's Object
pointer, and for LayerCollection's Collection pointer.

NOTE: A side-effect of this patch is that even IDs explicitely linked by
the user won't be kept anymore when writing files, i.e. they will not be
there anymore after a file reload, if they are not actually used.

Overhead of new process is below 0.1% in whole file saving process in
a Heist production file e.g.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D16605

2022-11-30 11:16:14 +01:00

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