getting a KEY_ESC event when resizing pycharm terminal

widnows 10, asciimatics 1.13.0, python 3.9.5

I am running Screen.wrapper in pycharm (either by using Emulate terminal option OR by using the terminal tab and running python.exe). After resizeing the terminal window a few times, i get a KEY_ESC keyboard event. that is a KeyboardEvent event with key_code=-1. I am not sure if this is a pycharm or asciimatics issue, however i was not able to get such an escape key event on resize when not using asciimatics.

debugging further i added in screen.py:

event = self._stdin.ReadConsoleInput(1)[0]
                if event.EventType == win32console.KEY_EVENT:
                    print(ord(event.Char)) ### added for dubug

add i am seeing 13 followed by 27 on these resizes. however if i just run input() in the terminal i do not seem to get such key events.

[peterbrittain]

Good point. That belongs in the troubleshooting docs.

[peterbrittain]

Was intrigued to know why this happened, so dug a little more… PyCharm uses pty4j, which uses winpty tocreate the console window (i.e. terminal in PyCharm). That last package does various things to manipulate the console.

In particular, it has this code to freeze/unfreeze the console output (https://github.com/rprichard/winpty/blob/7e59fe2d09adf0fa2aa606492e7ca98efbc5184e/src/agent/Win32Console.cc#L91). Call me suspicious, but that is injecting an escape key into the Window… which asciimatics then detects.

Definitely an interop issue with that package, so I’m going to close this now.