Cannot select multiple files in import style file choose
When opening the file chooser dialog to import style files, several files can only be selected initially. Once the directory has been changed, only single files can be selected. This might as well be a GTK3 problem. I observed this on my openSuSE 42.3 OS with the latest master branch.
If I modify the import_clicked() function such that the initial dir is the one that contains all my *.dtstyle files, it works. Once clicked anywhere else, it doesn't work any more.