In the past, around the time that 2.80 was released, 4a08b974f4
introduced the idea of filtering out certain editor changes inside
the paint modes and edit mode (e.g. changing brush sizes in the editor).
This commit is the first in a series to attempt to refine this behavior
so that only certain editor settings are filtered out from the undo
stack.
In total, it does the following:
* Adds the Brush datablock to the list of IDs that do not have undo
pushes.
* Adds support to filter out RNA structs that do not have the
`STRUCT_UNDO` property applied (currently, just the 3D Cursor).
This has the following effects:
* Changing brush settings inside the Image Editor no longer causes
undo pushes, becoming consistent with the other paint modes.
* Changing brush settings while in object mode in the outliner data
block view no longer causes undo pushes.
Co-authored-by: Campbell Barton <campbell@blender.org>
0dd326592a