Closing the panel to the left, should adjust the URL (like it does with closing right panel)

When opening a new panel at the right, fibery automatically adds the # symbol plus the path of the new panel to the URL.
This however is not happening when closing a left panel, the URL stays the same.

This is unexpected behavior, because URLs are used to create bookmarks and thus when saving a bookmark, the wrong double panel window is show, instead of the single panel window.