SUMMARY

I've noticed that on several occasions Konsole stops displaying the input characters. 

STEPS TO REPRODUCE

I have not yet determined how to reproduce this, but it has occurred several times over that past 3 months or so.

It seems to only happen when I have a long running process that has been going for several hours, eg if I leave and come back the next day while it's running. It's a server that auto restarts on a file change (watchmedo is used to restart a python process on file change).  A virtual env is also activated, I'm not sure if that matters.

OBSERVED RESULT

The output still is displayed and the input still works (can still run commands) it's just nothing that is typed is shown. The cursor simply sits at the start and doesn't move when typing or when I paste text with the mouse. Mouse scrolling works fine. 

It happens per tab, so opening a new tab works fine. Also I can choose "Copy input to" and that will show what is being typed in another tab.

Also Ctrl+C does not work while a process is running, eg running "sleep 10" and pressing ctrl+c does not abort, but if use send signal and choose SIGINT from the menu and that will interrupt the process.  

However if no process is running the "^C" IS displayed when pressed, it seems to be the only input that is printed (or that may be output by the shell).
 

EXPECTED RESULT

Input characters should be displayed as normal.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: KDE neon 5.16
KDE Plasma Version: 5.16.2
KDE Frameworks Version: 5.59.0
Qt Version: 5.12.3

ADDITIONAL INFORMATION

Apologies for the lack of info in this report. If there's anything I can do to get more debug info on this please let me know, I will try to figure out how to reproduce it.