Blender Git Loki

Enable modes according to the number of times the button is pressed

Transform: New feature to set a custom 'Snap With'

Ref T66484

Basically the idea is to use a modal keymap to change the current Base Point
defined by `Snap With` by one that can be chosen through snapping.

{F9170047}

I prefer to avoid using any of the modifier buttons (Shift, Alt, Ctrl) as
they can be used in the future to allow navigation during transform operations.

So the shortcut chosen in this patch is the {key B}.

Note:
This feature is not enabled if the scene snap option is Incremental or grid.

Maniphest Tasks: T66484

Differential Revision: https://developer.blender.org/D9415

# Conflicts:
# source/tools

Merge branch 'blender-v2.91-release'

Merge branch 'blender-v2.91-release'

Merge branch 'blender-v2.91-release'

Merge branch 'blender-v2.91-release'

Fix T82637: pack UV islands fails with some non-manifold meshes

Edges with 3 or more connected UV's caused UV pack to fail.

Instead of using functions from uvedit_parametrizer.c which are intended
specifically for ABF/LSCM unwrapping, use a simpler method for packing
which stores arrays of BMesh faces.

Still doesn't work, no bl_rna for IDProperties

BMesh: support for comparing loops when calculating face-groups

Add an optional callback to check source/destination loops for
BM_mesh_calc_face_groups.

This is needed so it can be used to calculate UV islands.

BMesh: add UV face transform and minmax utility functions

BLI_rect: add a float version of the 'pad' function

simplify typed access

cleanup

cleanup naming

cleanup

Merge branch 'master' into cycles_procedural_api

Merge branch 'blender-v2.91-release'

Fix T82064: Add Image Clone tool to overlay engine

The clone tool in the image editor can show a second texture on top
of the image. This wasn't ported and now results into alpha and depth
issues. This fix adds the clone tool drawing to the overlay engine.

Reviewed By: Cl�ment Foucault

Differential Revision: https://developer.blender.org/D9352

Clang-tidy, fix bugprone-exception-escape.

Remove redundant call to `ofstream::close()` from `~PSStrokeRenderer`
and `~TextStrokeRenderer`. ofstream will be destructed automatically.

- For `~Depsgraph`, `std::function`'s constructor can throw.
- Passing throwing statements in the lambda will not be detected by
clang-tidy.
Fix these issues by using lambda as function argument.

Reviewed By: sergey, sybren
Differential Revision: https://developer.blender.org/D9497

Merge branch 'blender-v2.91-release'