Blender Git Loki

Use cache only in current scene

Disable cache use, when rendering another scene seqbase.
Now cache limit applies only to one scene, so it can be overshot.
Cache of other scenes can be filled manually still.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4757

Fix T49589: 2.78 VSE no longer caching Node Editor scene strips

Sequencer cache was cleared when rendering compositor output.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4758

ClangFormat: enable ReflowComments

Cleanup: comments (long lines) in cycles

Cleanup: comments (long lines) in various intern/ libs

Cleanup: comments (long lines) in dualcon

Cleanup: comments (long lines) in rigidbody

Cleanup: comments (long lines) in mikktspace

Cleanup: comments (long lines) in atomic

Cleanup: comments (long lines) in string

Cleanup: comments (long lines) in utfconv

Cleanup: comments (long lines) in ghost

Cleanup: correct arg wrapping from recent cleanup

UV Sculpt: improve tool-system integration

In 2.7x UV sculpt was a kind of sub-mode
(a toggle with it's own key-map & drawing code).

Move this to an operator that uses the tool-system,
this simplifies internal logic, especially brush selection
which now matches sculpt and other paint modes.

- Remove toggle used to enable uv sculpt.
- Expose the brush, which was already used but there was no way to
select different brushes.
- Make UV sculpt use paint paint tool slots
(using brushes how all other paint mode currently do).
- Move UV Sculpt keymap to the tools keymap.
- Remove Q to toggle UV sculpt mode,
S/P/G keys to switch tools.

UI: show UV sculpt panels in the image editor

Fix line width for image sample size display

Eevee: Lookdev: Cleanup implementation & support for Bloom and TAA

Make Lookdev works with bloom and TAA by rendering it before TAA and fixing
the motion vectors of the lookdev balls.

Rework Lookdev to remove much of its complexity. Use simpler matrices with
more understandable setup code.

Eevee: Add support for alpha background in viewport

Viewport now displays alpha checkerboard pattern like Cycles does when
film alpha is set to "Transparent".

Some small workarounds were necessary for Depth of Field and correct TAA
support.

DRW: Draw checkerboard alpha pattern for Cycles

Add checkerboard alpha pattern like it was in 2.79

DRW: Add DRW_STATE_BLEND_PREMUL_UNDER

Just basic alpha under operation with premultiplied source.