Blender Git Loki

Render preview: Remove dedicated depsgraph

It is not needed since render pipeline will create its own depsgraph.

Depsgraph: Tag IDs for animation update on visible update

Without this it's quite unpredictable what state of unkeyed changes
datablock will end up with.

Depsgraph: Fix threading conflict between node animation and shading update

Depsgraph: Fix wrong debug message

Fix sculpt grab cursor

This was broken since 33bb8b785a9 (triple-buffer changes).
We need to account to the area limits when drawing the cursor.

Fix for material/node tree localization

The workaround removal was wrong, the whole id->adt of a local
copy is to be NULL.

But now instead of modifying original datablock, we tell library
manager to not copy animation data.

UI: Fix region_draw_azone_tab_plus missing/broken background.

This was due to the background being drawn by a batch that had its VAO
generated in the windows "UI" context.

Since we use the DRW ogl context to draw the entire area, we have to
regenerate the VAO for thoses UI batches to be drawn correctly.

Workbench: Show 3D Cursor Overlay

Initialize alpha discard for uiWidgetBaseParameters

No functional change, just playing safe and documenting how to
initialize the parameter in most of the cases.

Merge branch 'master' into blender2.8

Cleanup: split out extrude spin/screw

Since these will have their own manipulators,
its more convenient to keep them separate.

WM: warn when tool widget not found

This happens when testing adding tools, assert isn't useful.

Cleanup: trailing space

Cleanup: remove axis bounds ifdef

This was added for scale-cage manipulator, but seems generally useful.

Transform: expose 3D center/axis calculation

This is needed for other manipulator placement.

WM: add function to access last_properties

Metaball: pointers used in `DRW_shgroup_call_dynamic_add` don't need to hold the reference.

Armature: Envelope: Small cleanup + don't smooth the distance display.

The actual weighting calculation is not smooth as the bone display.

The bone itself can be smooth for esthetic purpose but the distance display
should match the underlying weighting formula.

Armature: Envelope: Optimize outline shader.

Armature: Envelope: Revisit envelope drawing again.

Past shader was too slow and had bad artifacts. This method is much simpler
and eficient and only exhibit some popping when the raidus of the head/tail
is changed.