"Add bookmark" shifts bookmarks down
When I drag a file to one of my bookmarks in the sidebar, as my pointer enters the sidebar, the "new bookmark" button appears above the existing bookmarks. As a result, the bookmark I was aiming for is moved down - often beyond the window limit. So I need to change the direction I was aiming for, or sometimes cancel my scroll, increase the window height, and try again.
I think this usability issue comes from the fact that the "new bookmark" button appears on top of the bookmark list, instead of under it. Alternately, show the "add bookmark" button all the time.