Blender Git Loki

CMake: fix error building with the version set to 300

When Blender's minor version was single digits, it wasn't properly
extracted. Resolve by adding zero padding.

Issue raised by @harley in D10954.

Cleanup: fix address sanitizer warning

Fix T87400: GPencil change Select Alternate defaults

Now, the Unselect Ends is disabled by default.

Fix T74680: Incorrect mixing in Glare node

The mixing function was designed to give correct results for Mix values of
-1, 0, and +1, but the behavior between these points was not linear. This is
unavoidable, because the function depends on both Mix and Mix^2 (by
multiplying value and mf) so they could not cancel out completely.

The new formula simply calculates the weighted sum without trying to invent
a smooth function.
Value for MixGlareOperation is now passed directly without scaling because
it is then easier to use.
Note that the previous formula performed max() twice for both input image
and the result, now there is just one max() per channel because the glare
input can't be negative.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D7138

UI/Nodes: Improve feedback when adding node fails (e.g. on drag & drop)

This is especially useful when trying to add a node group instance, e.g. via
drag & drop from the Outliner or Asset Browser.
Previously this would just silently fail, with no information why. This is a
source of confusion, e.g. earlier, it took me a moment to realize I was
dragging a node group into itself, which failed of course.
Blender should always try to help the user with useful error messages.

Adds error messages like: "Nesting a node group inside of itself is not
allowed", "Not a compositor node tree", etc.

Adds a disabled hint return argument to node and node tree polling functions.
On error the hint is reported, or could even be shown in advance (e.g. if
checked via an operator poll option).

Differential Revision: https://developer.blender.org/D10422

Reviewed by: Jacques Lucke

Previews: allow undo'ing datablock preview generation

Allow users to undo the effect of the "Generate Preview" operator in the
asset browser (`ED_OT_lib_id_generate_preview`). Without this, the
button is too dangerous.

Fix Cycles broken motion blur pass after recent bugfix

Fix T86880: Cycles bevel shader not working after editing world

Cleanup: Nodes: Use consistent errors for nodes built without features

GPencil: Bezier pen recalculate handles

Merge branch 'master' into temp-gpencil-bezier-stroke-type

Merge branch 'master' into temp-gpencil-bezier-stroke-type

GPencil: Allow bezier stroke sculpting

A check for the original stroke points was preventing sculpting of
bezier strokes.

GPencil: Set fixed resolution bezier pen

The Bezier pen used adaptive resolution which is not good, since the
user wants something that is independent from scale. E.g. the resolution
is the same when zoomed in/zoomed out.

GPencil: Change UI name and icon for bezier pen

GPencil cleanup: Fix compiler warning

Merge branch 'master' into temp-gpencil-bezier-stroke-type

Merge branch 'master' into temp-gpencil-bezier-stroke-type

Merge branch 'master' into temp-gpencil-bezier-stroke-type

GPencil: Bake Armature modifier for Bezier type