Blender Git Loki

Merge branch 'blender2.8' into topbar

Merge branch 'blender2.8' into topbar

Merge branch 'blender2.8' into topbar

Solve context issues when tweaking operator settings from top-bar

E.g. editing settings after transforming in 3D View would print
warnings, or in Movie Clip Editor wouldn't work at all.

We now store the area & region an operator was executed in and restore
it temporarily when redoing.
Ideally operators wouldn't depend on screen context for event-less
execution (exec callback), but we're far from that.

Remove operator redo panel from clip editor

Merge remote-tracking branch 'origin/blender2.8' into topbar

Move info editor removal versioning code to pre-lib-linking stage

Cleanup: Avoid duplicated topbar creation code in versioning code

Merge branch 'blender2.8' into topbar

Cleanup: Remove leftovers from when branch was based on workspace branch

Fixes for last merge

Merge branch 'blender2.8' into topbar

Merge branch 'blender2.8' into topbar

Cleanup: Change flag name, add comment

Clarify region size refreshing code in ED_screen_ensure_updated

Fix headers not using correct background color

Top-bar operator settings: Add simple "More..." button to show all settings

Doesn't make much sense yet, but it will once operator settings are
split into basic and advanced ones (see D2883).

Fix errors in UI scripts after last merge

Patch by @sergey, with minor fixes.

Merge branch 'blender2.8' into topbar

Rework tab data storing to fix glitches & get rid of hacks

Fixes glitch where hovering an active tab would make the tab appear like
a hovered non-active one.

Still not the most beautiful solution, but it's as good as it can get
with our current UI code I'm afraid.