Blender Git Loki

Merge branch 'blender-v2.81-release'

Fix T66124: Gizmo orientation doesn't refresh when making face

EditMesh: avoid undo push on face creation if no action is made

Merge branch 'master' into greasepencil-object

Fix tool leader-key consuming mouse wheel events

Cleanup: adjust layout for example experimental UI

- Use a separate split for each feature,
since two top-level splits can become un-aligned.
- Only show the task instead of the entire URL.

User Preference Experimental Tab

Experimental tab in User Preferences for experimental features.
The tab option is only visible when "Developer Extras" is on.

Included here is a (commented out) example panel to be used as a
template for the new experimental panels. Since these panels will come
and go it is nice to have a reference in the code.

Differential Revision: https://developer.blender.org/D6203

Merge branch 'master' into soc-2019-bevel-profiles

Changes from Campbell and feedback from review.

Overlay Engine: Empties

Merge branch 'blender-v2.81-release'

Fix dyntopo sculpt not setting vertex indices dirty

This is an old bug exposed by new cursor drawing
which uses vertex indices.

Cleanup: clang-format

Merge branch 'blender-v2.81-release'

Merge branch 'blender-v2.81-release'

Cleanup: spelling

Cleanup: clang-format

GPencil: Fix Box Selection Tool keymaps

GPencil: Use Mask in Vertex Paint operator

GPencil: Fix error in versioning for old files