[gtk3] Quick Open doesn't work

[egmontkob]

With the string "filename.txt:42" at the beginning of a line:

• Right click -> Open Link prints: "gio: filename.txt:///42: The specified location is not supported"

• Ctrl+click, without "Quick open in current terminal" prints: "FileNotFoundError: [Errno 2] No such file or directory: '/proc/(True, child_pid=1234)/cwd'"

• Ctrl+click, with "Quick open in current terminal" prints: "TypeError: Vte.Terminal.feed_child() takes exactly 3 arguments (2 given)"

Similar errors occur with the other regex match too (the gio one is even scarier there).

[egmontkob]

(As a side note, see also VTE bugs 792729 and 792730.)