Folder comparisons get out of sync when the keyboard is used to expand/collapse the tree structure.

1. Do a folder comparison of similar folders which contain sub-directories
2. Close or open one of the sub-folders by clicking on the +/- icon with the mouse --> As expected, the folder closes/opens on both sides of the tree view, not just in the side that was clicked.
3. Close or open one of the sub-folders by selecting it and pushing the left or right arrow key on the keyboard (or the plus or minus key). --> Only the side which has primary focus is opened/closed and the views become out of sync. Changing the selection brings the scroll positions back in sync temporarily but using the scrollbars gets them out of sync again, making comparing the folders very difficult, especially if you don't realise why it's now behaving so contrarily.