Blender Git Loki

Fix T56273: User count assert on re-saving a particular file.

new background image/clip of Camera ID was totally wrong, down the old,
broken 'way it used to be' instead of using new, more generic system.

Those ID pointers were not even added to library_query.c file, shame! xD

GP: Change to make the temp name unique

The previous commit could fail if some corner situations. This new temp name must be unique always.

Fix T55095: Undo crash w/ linked library data

Fix T56270: Crash when save a grease pencil file with instance modifier.

The error was related to duplicate names in the internal hash used to order instances in z-depth.

GP: Check render status before use it.

Fix T56251: Outliner crash on selecting nested.

We need a valid tree here, undo step will make it invalid...

Fix faulty opti radi extend logic

Merge branch 'master' into blender2.8

Ghost/X11: correct function signature

Merge remote-tracking branch 'refs/remotes/origin/blender2.8' into fracture_modifier-2.8

Merge branch 'master' into blender2.8

Fix T54584: Crash w/ image undo

Using accumulation undo type (eg painting)
as the first undo step, broke code which adds an initial memfile undo.

Minor tweak to last commit

3D View: hide object centers in paint modes

Match 2.7x behavior

UI: only show vertex select w/ weight paint mode

Was being used for vertex paint where it's not supported.

Vertex Paint: use original mesh data

This is already done in weight paint mode,
avoids a mesh refresh on selection changes.

Fix missing uniform for vert/weight/texture paint

Entering any of these modes would assert immediately.

UV: stitch multi-object support

D3561 by @Al

UI: don't show pie menu w/ no active object

Addresses T56272

Updates to OpenVDB import and volume motion blur.

* Separated option for Volume Motion Blur in object UI. Unlike deformation motion, it is disabled by default.
* Added multiple frame import and preview simplying for imported VDBs.
* Fixed a couple of bugs with VDBs in the viewport.