New feature in bash 5.1/readline-8.1 rc1 breaks python-pexpect

[Dr. Werner Fink]

Hi,

after build rc1 of bash 5.1 as well as readline-8.1 I've set up test
staging process.  During build the package python-pexpect throws errors
in its test suite, e.g.

[  260s] self = <tests.test_async.AsyncTests 
testMethod=test_async_replwrap_multiline>
[  260s] 
[  260s]     def test_async_replwrap_multiline(self):
[  260s]         bash = replwrap.bash()
[  260s]         coro = bash.run_command("echo '1 2\n3 4'", async_=True)
[  260s]         res = run(coro)
[  260s] >       self.assertEqual(res.strip().splitlines(), ['1 2', '3 4'])
[  260s] E       AssertionError: Lists differ: ['\x1b[?2004l', 
'\x1b[?2004h\x1b[?2004l', '1 2', '3 4', '\x1b[?2004h'] != ['1 2', '3 4']
[  260s] E       
[  260s] E       First differing element 0:
[  260s] E       '\x1b[?2004l'
[  260s] E       '1 2'
[  260s] E       
[  260s] E       First list contains 3 additional elements.
[  260s] E       First extra element 2:
[  260s] E       '1 2'
[  260s] E       
[  260s] E       - ['\x1b[?2004l', '\x1b[?2004h\x1b[?2004l', '1 2', '3 4', 
'\x1b[?2004h']
[  260s] E       + ['1 2', '3 4']

I found this is caused by (_rl_)enable[-_]bracketed[-_]paste as the sequences
are defined in rlprivate.h

 #define BRACK_PASTE_INIT  "\033[?2004h"
 #define BRACK_PASTE_FINI  "\033[?2004l\r"

indeed it is a nice feature to see highlighted paste content on the interactive
command line, but why this interferes with tools like pexpect using bash in
interactive mode?

Werner

-- 
  "Having a smoking section in a restaurant is like having
          a peeing section in a swimming pool." -- Edward Burr

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