curses: returns incorrect chars after resuming a suspended process

[darrikonn]

BPO	43854
Nosy	@serhiy-storchaka

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-04-15.10:17:59.477>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.7', 'library']
title = 'curses: returns incorrect chars after resuming a suspended process'
updated_at = <Date 2021-04-15.19:45:15.028>
user = 'https://bugs.python.org/darrikonn'

bugs.python.org fields:

activity = <Date 2021-04-15.19:45:15.028>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-04-15.10:17:59.477>
creator = 'darrikonn'
dependencies = []
files = []
hgrepos = []
issue_num = 43854
keywords = []
message_count = 2.0
messages = ['391126', '391151']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'darrikonn']
pr_nums = []
priority = 'normal'
resolution = 'third party'
stage = None
status = 'pending'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43854'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[darrikonn]

Using the arrow keys after resuming a suspended process yields 27 (escape) from getch/get_wch/...

Steps to reproduce:

# test.py
from curses import wrapper

def main(stdscr):
    # Clear screen
    stdscr.clear()

    key = 0
    while key != 27:
    	key = stdscr.getch()
        stdscr.addstr(0, 0, str(key))

    stdscr.refresh()

wrapper(main)

1. python test.py
2. ctrl-z
3. fg
4. <arrow_down>

This gives the char 27 which is the escape character and therefore exits the python script.

[serhiy-storchaka]

Python method is just a thin wrapper around corresponding curses function (wgetch() in this case). It looks like an issue is in the curses library. We cannot do anything with it.