Blender Git Loki

Cleanup: code style & cmake

added tbb support for mantaflow

if openmp is not present or disabled we now use tbb manta pp files as a fallback to provide at least some acceleration

Add support for Objects in Drive variable `Rotational Difference`

Thus it is according to the Manual
https://docs.blender.org/manual/en/dev/animation/drivers/drivers_panel.html#driver-variables

Correct recent bmesh separate addition

- Was setting flag incorrectly to avoid re-use.
- Check edge has loops before accessing.

BMesh: Fix BM_face_loop_separate_multi

When the loop region passed in had no loops to edge-split from,
it was assumed nothing needed to be done.

This ignored the case where loops share a vertex
without any shared edges.

Now BM_face_loop_separate_multi behaves like BM_face_loop_separate.

Fixed error where faces remained connected by verts in BM_mesh_separate_faces.

Fix T50888: Numeric overflow in split kernel state buffer size calculation

Overflow led to the state buffer being too small and the split kernel to
get stuck doing nothing forever.

BMesh: add BM_mesh_separate_faces

Fast-path for bmesh split operator which duplicates and deletes.
Use when only separating faces, currently used by the intersect tool.

Makefile: set tab width=4

Fix text and icon positioning issue on high DPI, after recent changes in 32c5f3d.

Fix OpenCL warnings about doubles on some platforms.

Breakdowner - Constrain Transform and Axis

This commit adds new features to the breakdowner, giving animators more
control over what gets interpolated by the breakdowner. Specifically:

"Just as G R S let you move rotate scale, and then X Y Z let you do that
in one desired axis, when using the Breakdower it would be great to be
able to add GRS and XYZ to constrain what transform / axis is being
breakdowned."

As requested here:
https://rightclickselect.com/p/animation/csbbbc/breakdowner-constrain-transform-and-axis


Notes:
* In addition to G/R/S, there's also B (Bendy Bone settings and C (custom properties)
* Pressing G/R/S/B/C or X/Y/Z again will turn these constraints off again

Cleanup: Add comment about use of ID pointer in TreeStoreElem

Fix unwanted expanding/collapsing of collections using drag & drop

Turned out to be a quite easy fix. I thought the issue was that we
couldn't identify the TreeStoreElem when (re)creating its TreeElement item
correctly, because for non-ID elements that would be index dependent (=
bad for drag & drop). Turns out that we're actually allowed to store
custom data within the TreeStoreElem, the thing is just that it gets
stored as ID pointer (highly ugly and highly misleading).
Anyway, seems to work now so I won't complain too much :)

Merge branch 'master' into fluid-mantaflow

Ouliner drag&drop: Correct/increase margin for triggering insert into

Insert into master collection when dragging above it

Outliner: Support dragging objects into different collections

Doing so will remove the object from the old collection and insert it
into the new one.

Outliner drag&drop: Do generic check if no custom poll callback is defined

And quite some cleanup.

Layers util function to move objects around

This is required for outliner, so we can move an object from a collection into another

rBa81ea408367abe2f33b351ff6dcc6b09170fd088 "object" -> "target"