Commits on May 19, 2022

1. Handle keypad mode cursor key escape sequences. …

   Normally the terminal uses CSI escape sequences when the UP, DOWN,
   LEFT, RIGHT and HOME, END keys are pressed. These look like the
   following ESC [ A etc, where ESC [ is the CSI sequence.
   
   xterm and other terminals however can generate an alternative
   escape sequence called SS3 if in the application keypad mode.
   This sequence is ESC O A etc.
   
   Bash readline understands both modes so nowadays you rarely
   see OA being printed when you press the up arrow while the terminal
   is using the keypad mode. readline currently does not understand
   these sequences.
   
   To test this fix, I used an xterm and put it in keypad mode
   using the command "tput smkx". Then I started the readline-demo
   and tried using arrow keys. Without this fix, OA is printed when
   I press up. With this fix, readline fetches the previous command
   as per regular mode. After testing you can escape back to
   regular mode using "tput rmkx".

   

   tpodowd committed May 19, 2022
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