See T95597

loop tools uses a custom matrix inverse function with high precision.
So this precision has to extend to other parts.

Differential Revision: https://developer.blender.org/D5240

This can cause bugs where if the operator throws an exception, undo is not
properly enabled again. There have been maybe a dozen Blender bug reports
related to this. This could get worse now that we are autosaving preferences.

Some add-ons guard against this, but turning off undo should not be needed in
the first place. If the operator is set to do an undo push, any operators it
calls will automatically not do any undo pushes.

If this fail in some cases, it should be reported as a bug in Blender. I could
not find issues or a performance impact testing a few add-ons though.

Differential Revision: https://developer.blender.org/D4908

Addresses new behavior of object.to_mesh().

This is corresponding part for D4875.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4876

Mainly search-and-replace approach.

Tested the enabled-by-default export/import addons. Seems to work with
an exception of X3D which is still referencing Blender Internal material
properties.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4866

Grease pencil must have name 'GPencil'.
Script take only the first strokes.

own recent error in rBA73f88be5067b

also fix matrix multiplication ('@')

Fixes T60706

followup to rBA3148c4219f001511b69c3fb31dfedca98b9f4360

Fixes T58714