Blender Git Loki

Forbid flipping regions in top-bar

Merge branch 'blender2.8' into topbar

Merge branch 'master' into blender2.8

Remove SCREEN_OT_header_flip, use SCREEN_OT_region_flip instead

Basically reverts rB65c4149f203610 and fixes the issue in a better way.

Keymaps using the removed operator will be affected. Switching header
from top to bottom now has the shortcut F5, just like switching other
regions.

Fix T52984. Trackpad rotation to natural direction

Fix crash when trying to make top-bar area full-screen

Top-bar should never be full-screen, so disable operator.

Fix small Python/typo on "Outliner Collection Operation"

Amber: some more dev (tags UIList ordering, some WIP on adding new assets...)

Skip loading tool keymaps in background mode

Move background images into the camera

This moves background images out of the 3D viewport,
to be used only as camera reference images.

For 3D viewport references,
background images can be used, see: D2827

Some work is still needed
(background option isn't working at the moment).

Merge branch 'master' into blender2.8

Using gtest fixtures in Alembic export tests

Cleanup: Remove unused argument from ED_update_for_newframe

This funciton will be extended, so better to get rid of unused arguments before
adding new ones.

Amber: add new assets with relative path to repo, fix a bug in asset listing when path was aboslute.

Fix / workaround T53164: Crashes with background scenes

Simple workaround in on_visible_update(). There might be more missing updates or tags.

Tool System: experimental low-poly construction

Tool for creating polygons, exact usage may change based on feedback.

LMB to add faces at boundaries (tris from edges, quads from verts).
- Ctrl splits edges
- Alt to dissolve edges/verts.

Works well with vertex snap & auto-merge.

This uses selection hover but isn't intended to introduce more widely
pre-selection highlighting, at least it will be restricted to this tool.

Amber: Add initial real asset preview.

Design is a bit weak, ideally we'd rathe use directly .blend files
previews, but we need some RNA API work to handle that...

Fix a bug in filedraw, when we have only entries, with no variant etc. below.

Merge branch 'master' into blender2.8

Manipulator: Use object bound-box for scale cage

Without this, scaling single objects wasn't working usefully.