Blender Git Loki

Cleanup: rename variables 'gizmo_snap' to 'snap_gizmo'

And a minor fix when there is no `USE_SNAP_DETECT_FROM_KEYMAP_HACK`.

Merge branch 'blender-v2.90-release' into master

Merge branch 'blender-v2.90-release' into master

Fix T79517: Data Transfer modifier fails in edit-mode

Fix mesh data-transfer tracking if a change was made

Fix compile error after recent cleanup

GPencil: Recalculate curve when stroke data changed

Merge branch 'blender-v2.90-release' into master

Python: don't remove existing context overrides when calling an operator

Reviewers: campbellbarton, brecht

Differential Revision: https://developer.blender.org/D8532

Timers: set first window as context in timer

This avoids some crashes when running Python code in timers.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D8531

Cleanup: Strict compiler flags

Mainly caused by moving tests to source folder, which brings
new compiler flags.

Also, no need to extend include directories (to the non-existing paths,
btw) since this is done by the CmakeList.txt which is in the blenlib folder.

Depsgraph: Use UUID to match modifiers

Solves possible pointer-based comparison fiasco.

Another nice outcome of this is that topology cache will now be
preserved throughout the undo system. For example, undo of object
transform will not require topology cache to be re-created.

Differential Revision: https://developer.blender.org/D8493

Modifier: Maintain per-modifier session UUID

Allows to keep track of modifiers, which is required, for example,
for runtime data preservation in depsgraph.

Fix report visibility issues

GPencil: Fix lag editing strokes

During the changes for curves, the Hash insert key line was removed by error.

Fix: refresh every space info area on selection change

Report selection is stored per report, not per space

Fix path regression test build failure on Windows

The file was including BKE. It was a required fix for another
compilation error a while back. It is a bad level include, and
seems is not needed anymore.

Merge branch 'soc-2020-greasepencil-curve' into greasepencil-edit-curve

Merge branch 'blender-v2.90-release' into master

Fix memory leak setting error text in the data-transfer modifier