Infobar should show busy indicator until correct data is shown.

Version: 4.20.7

When selecting many files, especially on slow or network filesystems, the infobar will take a while to change. In a specific example, on a smb share with 500+ files, it can take up to 10 seconds. During this time, the infobar will display the previous selection information.

When the selection is changed, the infobar should be emptied or show "loading selection information..." or something like that until the selection information has been retrieved.