After user navigates up in the filechooser folder selection mode by pressing one of the breadcrumb buttons (or otherwise, via a keyboard shortcut, for example), remove the selection of the current subfolder in the chooser.

Other information:
When the filechooser is used in the folder selection mode and the user navigates up (either via double-clicking the '..' entry or by clicking the breadcrumb buttons) the sub-folder from where he came from is still selected. If the user clicks the "Open" button at that point, he would expect to open the folder that he has just navigated to and not the subfolder that he just left.