[gtk3] "ls -l" output underlined, should disallow space in filename

(Even with Quick Open disabled)

Execute `ls -l` and mouseover an entry that is newer than half year (showing hh:mm instead of year), e.g.

drwxrwxrwt 16 root root 20480 Jan 25 01:19 tmp

Notice that up to (including) the timestamp it's all underlined.

I believe that the second regex of Quick Open assumes that this is a file named "drwxrwxrwt 16 root root 20480 Jan 25 01", and line 19.

Ctrl+click also prints silly things.

I think an easy and nice workaround could be to remove space from the allowed characters of filenames.