Respond to bg and fg color ansi queries #1358
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This change adds support for OSC 10 and 11. These can be used by terminal panes (or apps running inside terminal panes) to query the terminal's foreground and background colors (the response is sent through STDIN).
To do this, we use these queries ourselves on startup and on SIGWINCH, parsing saving the response and sending it back when we in turn are queried.
To try it out:
echo -e "\033]10;?\033\\"echo -e "\033]11;?\033\\"