Reordering collapsed Projects

What I did:
Tried to move a collapsed category in between or after other collapsed categories.

What happened:
It would only try to make the category a subcategory instead of keeping it as a top-level category.

What I expected:
I wanted to simply change the order of the categories, by drag-and-drop.

Things that might be helpful to know (Agenda version, OS and model, etc):
When I exanded the other categories, then it would let me rearrange them as categories without attempting to make them subcategories.

Unfortunately this is due to the limitation of the sidebar system at the moment, making it impossible to discriminate between a drag-before from a drag-on type event. The workaround is to expand the category first indeed.