Blender Git Loki

Fix Copy Selection to Buffer breaking library paths.

This is a bug experienced by animators in the Blender Studio that developers
have been trying to fix for a /long/ time.

What happens is that partial file writing extracts the needed datablocks from
the main list of datablocks into a smaller one. Afterwards they are added back
to the main list, but in some cases not exactly in the same order.

There is file path remapping code that depends on the datablocks being in
exactly the same order as before, and when this was not the case filepaths
would get swapped between datablocks

The reason datablocks are not restored in the same order is because the sorting
of datablocks by name is a) case insensitive and b) undefined if there are
multiple datablocks with the same name from different libraries. This should
be made well defined, but the fix in this commit is simpler.

The way animators ran into this bug is that they use the Copy Attributes addon
a lot, which has as the first item in the menu Copy Selection to Buffer. In
some cases this would be clicked accidentally when menu is near the edge of the
window, breaking the library paths which would only be noticed a much later on
file save and reload.

The way this bug was finally tracked down is that it was suspected that the
undo system was the cause, and so Bastien added library validation for undo.
When Hjalti then did undo and noticed the error, he remembered accidentally
clicking Copy Selection to Buffer just before, and we could finally reproduce
the bug.

Merge branch 'master' into blender2.8

Fix Copy Objects to Buffer breaking library paths.

This is a bug experienced by animators in the Blender Studio that developers
have been trying to fix for a /long/ time.

What happens is that partial file writing extracts the needed datablocks from
the main list of datablocks into a smaller one. Afterwards they are added back
to the main list, but in some cases not exactly in the same order.

There is file path remapping code that depends on the datablocks being in
exactly the same order as before, and when this was not the case filepaths
would get swapped between datablocks

The reason datablocks are not restored in the same order is because the sorting
of datablocks by name is a) case insensitive and b) undefined if there are
multiple datablocks with the same name from different libraries. This should
be made well defined, but the fix in this commit is simpler.

The way animators ran into this bug is that they use the Copy Attributes addon
a lot, which has as the first item in the menu Copy Selection to Buffer. In
some cases this would be clicked accidentally when menu is near the edge of the
window, breaking the library paths which would only be noticed a much later on
file save and reload.

The way this bug was finally tracked down is that it was suspected that the
undo system was the cause, and so Bastien added library validation for undo.
When Hjalti then did undo and noticed the error, he remembered accidentally
clicking Copy Selection to Buffer just before, and we could finally reproduce
the bug.

Links: update development fund link to new URL.

Fix assert/crash when copying RGBA color into RGB

For example, copy from viewport display color into brush color.

Outliner: drop into master collection when below everything else

Reviewers: brecht

Differential Revision: https://developer.blender.org/D3810

Cleanup: Remove more #if 0 blocks

Continuation of https://developer.blender.org/D3802

Reviewers: brecht

Differential Revision: https://developer.blender.org/D3808

Fix debug build after recent changes.

Eevee: Fix default texture coord for procedural texture in world tree

Cleanup: node_tex_checker: Vectorize operation in GLSL

Fix use of uninitialized variable in cloth collision.

No apparent difference in a quick simulation, but was clearly wrong.

Cleanup: fix compiler warnings.

UI: closure some more panels by default, leaving open mostly 1 per tab.

PyAPI: Support for custom tool registration

Added a module bpy.utils.toolsystem which only exposes ToolDef,
to avoid scripts referencing bl_ui internals.

Tool System: expose shear tool x/y option

Keymap: use tweak event for shear

Gizmo: tweak sorting to avoid view-aligned shear

Gizmo: remove 'Click Anywhere' option

Having an invisible gizmo caused event handling problems (see: T56603).

This is hard to avoid since gizmos are similar to buttons in the way
they have priority over the regular keymap.

Transform events use tweak so events to fall though to the general
view 3d keymap (for cursor placement for eg).

Cleanup: style

Cleanup: use mul_m3_series