Unicode symbols in the menu title seem to produce newlines on redraw

[GPMueller]

The observed behaviour is that on each redraw (e.g. when moving the selection cursor), a newline is added in the terminal in front of the menu, if unicode characters, such as ❓ are present in the title.

The specific instanciation in our problem-case is

terminal_menu = _TerminalMenu(
        candidates,
        title="\n---------- ❓ Please select the references you want to modify",
        multi_select=True,
        show_multi_select_hint=True,
        multi_select_select_on_accept=False,
        multi_select_empty_ok=True,
    )

As far as we could tell it is not related to the \n at the beginning of the string.

System:

• Ubuntu 16
• Python 3.8.5

[ostanislaw]

ok, just verified at Ubuntu 20.04 it does not reproduce (moved 2 items down): The same with python:3.5.10 docker image: docker run -it --rm -v=/home/sos/Downloads:/test_dir python:3.5.10 /bin/bash pip3 install simple-term-menu

 locale 1116ms LANG=en_US.UTF-8

python3 simple_term_menu_unicode_bug.py 1574ms someting with unicode ->>❓<-- would reproduce issue
a
b
c

d

But please see what happen in our developement docker container with ubuntu 16.04: each move of selection I have another line with menu printed: $ python3 simple_term_menu_unicode_bug.py someting with unicode ->>❓<-- would reproduce issue someting with unicode ->>❓<-- would reproduce issue someting with unicode ->>❓<-- would reproduce issue someting with unicode ->>❓<-- would reproduce issue
a
b
c

d

TEST CODE:  cat simple_term_menu_unicode_bug.py from simple_term_menu import TerminalMenu

menu = TerminalMenu( ['a', 'b', 'c', 'd'], title="someting with unicode ->>❓<-- would reproduce issue", )

menu.show()

Maybe it's some issue with locale settings (affected docker container)? locale LANG= LANGUAGE= LC_CTYPE="C.UTF-8" LC_NUMERIC="C.UTF-8" LC_TIME="C.UTF-8" LC_COLLATE="C.UTF-8" LC_MONETARY="C.UTF-8" LC_MESSAGES="C.UTF-8" LC_PAPER="C.UTF-8" LC_NAME="C.UTF-8" LC_ADDRESS="C.UTF-8" LC_TELEPHONE="C.UTF-8" LC_MEASUREMENT="C.UTF-8" LC_IDENTIFICATION="C.UTF-8" LC_ALL=C.UTF-8

[IngoMeyer441]

Thanks for your bug report. I'm currently on vacation (until the end of the month) but of course I can look into this when I am back.