The idea is to de-duplicate logic in DEG_id_tag_update() and flushing where we
need to translate depsgraph tag or component type to ID level recalc flag.
Currently unused, but is required for Blender 2.8.
Not only this helps merges form master to the branch, but also:
- Allows us to production-check changes as soon as possible.
- Avoids some unnecessary editors update about ID changes.
- Adds small optimization on queue size by always keeping one of the pointers
outside of the queue.
The idea is to allow iterating over ID nodes in exact order of their
construction, and in order which will not change dependent on memory
pointers or anything.
Now we stick to a single button, when data is directly linked, clicking
on it will make a local copy, while shift-clicking on it will make a
static override.
When data is a static override, icon is the DATA_OVERRIDE one, and clicking
on the button will make it a fully borring local data-block.
This is just the 'linked' icon with top-down arrow instead of left-right
one, if any graphist feels more inspired... ;)
Note that this is 'new inkscape' version of the svg file, hope
everything is alright (it does change all icons whe re-exporting :/ ).
Code also handling auto-generation of static overrides.
Aside from some naming consistency cleanup, this commit:
* Is the first step addressing the 'operator' issue with static
overrides, by implementing a first version of the 'restore from
reference' behavior.
* Fixes several issues that were discovered on the way in enhanced
RNA comparision code, like the 'zero-length dynamic array' case, or some
infinite looping caused by some non-ID pointers (that for some
mysterious reasons did not show up previously...).
* Factorizes a bit said RNA comparison code (auto-static override
generation and comparison/check were essentially doing the same thing).
This flag means that the pointer does not 'own' the data it references.
This is the case of nearly all ID RNA pointers (NodeTrees will probably
again be some nasty exception here :( ), but also several other cases.
That kind of information is mandatory for complex processing over whole
data-blocks done in RNA, like some static override tasks (advanced
comparison...).
