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Add configure switch to define USE_XON_XOFF

From: Ivan Kozlov
Subject: Add configure switch to define USE_XON_XOFF
Date: Fri, 06 Nov 2020 21:25:13 +0300

Readline tests that macro and suppresses software flow control. This is quite 
handy: I want software flow control, just not *in bash*, where it is not useful 
and I would like C-s to do incremental search instead. With USE_XON_XOFF, it is 
inactive in bash and is restored before executing a command alongside other 
termios settings. It is probably possible to hack this with PROMPT_COMMAND/PS0, 
but clearly this is a much cleaner and readily available option. The only thing 
lacking is a configure switch.

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