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Bastien Montagne b47a234f98 BKE_Main: Add clear separation between 'temp' mains and global main. ...

Blender is using more and more temporary Main data-base (historically
for reading linked data, but also now when resyncing liboverrides, for
temp data in asset code, etc.).

This commit aims at making this a bit more formal and defined, by:
* Adding a dedicated flag in Main struct to mark a Main as global.
* Adding some API to replace, or temporarily swap the current global
  Main (`G_MAIN`) by another one.

NOTE: Having to temporarily replace `G_MAIN` is a workaround for the
limitation of current RNA, ideally this should be fixed in RNA itself,
but for now at least having an API helps tracking those cases (since
this is potentially risky operation).

This work is also a preparation for more usages of temp mains in the near
future (Asset Brushes and its presets system e.g. will most likely use
temp mains too).

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D15977

2022-10-05 14:26:45 +02:00

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