I use Ctrl-s as my GNU screen escape key, rather than the default Ctrl-a. This doesn't seem to work when I use fish (2.0 or master) as my shell.

Nothing at all happens when I press Ctrl-s, and whatever I type next just appears in the terminal. For example the screen command to create a new window is "Ctrl-s c", but this just prints the "c" into the terminal.

Under bash I did have to turn off terminal flow control with "stty -ixon" to use Ctrl-s, but this setting doesn't seem to change anything under fish.