Function tab_command 

pub fn tab_command(
    t: Terminal,
    script: &Path,
    directory: &Path,
    shell: WindowsShell,
) -> Vec<String>

The tab command, program first (spec Launcher step 4). mate-terminal and xfce4-terminal split the ONE -e string with g_shell_parse_argv, so that element is the script path single-quoted with every ' written as '\''; gnome-terminal and konsole take argv elements and get the raw path.