When dragging an area to a new location, current code limits the size
of the target area to AREAMINX and HEADERY, which is the minimum sizes
that an area can occupy. This is too small and results in frustration
for some users. When moving an existing area you are unlikely to want
it to be an unusable size. This PR makes the minimum target size 3X
wider. If an area is not large enough to be bisected into two such
areas then it won't be offered as a docking target in that orientation.
Pull Request: https://projects.blender.org/blender/blender/pulls/130546
f339ab4325