00a36cbf24
This is a nasty gathering of several issues, main one being that 'local
collections' of 3DViews are still updated immediately instead of the
deferred update used for all other viewlayer cases.
The change in a16bcb6576 led to internal references to the Scene's
master collection to become invalid, which is the expected behavior.
But this turns the Scene's view_layers into invalid state too.
Ideally, there should never be resync of viewlayers of a scene being
deleted anyways.
For now, take the (hopefully!) safe approach of explicitely forbidding
any viewlayer update during ID deletion process, and deferring it at the
end of the process.
Note that this change may also give some marginal gerformance
improvements in some rare edge cases (like deleting a very heavy scene
with many collections and 'local collection' 3DViews ?).
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