If you have a changed file from which you wish to commit some changes you can do this in by split view staging mode by staging some hunks, selecting the staged files, and then pressing commit on the menu or toolbar. However if you use my normal workflow and right click in the staging area the view is bounced into 'no staging' mode. (This is the actual bug, right?) The selection is correctly maintained, but any files which are partly staged become fully staged and will be commited as such.