Regions that change their size in the layout phase (something that is
supported for a while now) might affect the size of following regions.
For example the asset shelf design forsees that it takes space away from
the tool- and sidebar. When its size changes, tool- and sidebar need to
redraw.
Without this there is a crash in the `asset-shelf` branch:
- Open sidebar
- In the asset shelf Display Settings popover, toggle "Names" twice.
At first the sidebar will be empty, when toggling the second time a
null-dereference will cause a crash. This is because the layout phase of
the sidebar does not run, but after that the region size is updated,
it's tagged for redraw and the draw phase runs (without any layout).
Pull Request: https://projects.blender.org/blender/blender/pulls/110212
4137f9a87f