GTKFileChooser: deselect highlighted directory
Steps to reproduce
Open a random file save form.
Current behavior
Usually the first entry in the file list gets highlighted automatically. So the user may click on another entry to change the selection, but clicking on the background does not cause a deselection to take place. In my opinion that would be an expected usage pattern as it is the case on common other platforms. Why is that important? Sometimes the user just needs to choose the working directory and not a particular file. The only valid (and nasty) workaround is to go one hierarchy upwards and then double-click the directory folder. The folder gets opened and the user finally finds him/her-self with no entry highlighted.
Expected outcome
Deselections should work.
Version information
GTK 3 on Ubuntu 18.04.4 LTS
Additional information
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