Merge remote-tracking branch 'origin/blender-v2.82-release'

Alembic depsgraph: explicitly add ANIMATION -> CACHE dependency

This dependency was removed in fd0bc7e002ced8ffd85e9aa3edcae173dbd13392,
as there already were dependencies ANIMATION -> PARAMETERS and
PARAMETERS -> CACHE, making ANIMATION -> CACHE unnecessary.

Upon subsequent inspection, the ANIMATION -> PARAMETERS dependency was
there due to the fallback behaviour in
`RNANodeQuery::construct_node_identifier()`. Now this is no longer
relied upon, and the required relation is made explicit again.

Merge remote-tracking branch 'origin/blender-v2.82-release'

Fix T72660: Alembic caches are not properly updated by drivers

Drivers were not considered when building the dependency graph for
`CacheFile` datablocks.

Cleanup: reformatted after NULL -> nullptr in depsgraph C++ code

No functional changes.

Cleanup: changed NULL to nullptr in depsgraph C++ code

No functional changes.

Document that tessellate_polygon() doesn't handle degenerate geometry

This 'fixes' T68554: 'API mathutils.geometry.tessellate_polygon returns
bad results sometimes' by documenting the limitations of the current
implementation.

I've also added a unit test for the function, so that any change in this
behaviour will get noticed.

No functional changes.

Fix T73001: Shader Node with driver not updating when animated

When there are ID properties on an object, and these are animated and
used by a driver, the depsgraph has proper connections between ACTION ?
ID PROPERTY ? DRIVER.

When these properties are defined on a mesh, however, the depsgraph
relations are incorrectly created between GEOMETRY ? PROPERTIES_EXIT ?
DRIVER (because it's assumed that 'source = ENTRY' implies 'geometry').

This patch solves this by first checking whether the targeted property
is an ID property and handling it accordingly. This also made it
possible to remove some special cases from pose bone relations.

Maniphest Tasks: T73001

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D6571

Fix T71311 Bridge Edge Loops crash when bridging cube edges

This commit will prevent the crash. It does produce a result that may not
be desirable (only briding one face of the cube), but at least it's better
than crashing.

Fix T73279: Particle Rotation checkbox enabled when a bake exists

The contents of the Rotation panel was already disabled when a bake
exists, but the checkbox in the header wasn't. Since rotations are part
of the baked data, it doesn't make sense to enable/disable rotations
after baking.