DECSCPP causes the terminal to hang

[j4james]

Contour Terminal version

0.3.12.262

Installer source

GitHub: release page

Operating System

Ubuntu Linux 22.04

Architecture

x86-64

Other Software

No response

Steps to reproduce

Attempt to use the DECSCPP sequence to set the terminal width, e.g. from a bash shell:

printf "\e[132\$|"

Expected Behavior

The width of the terminal should change.

Actual Behavior

The width remains as it was, but the terminals hangs. There is no further output, and it doesn't respond to keypresses. If I try to close the window, I get a message from the OS saying "This window is not responding. Do you want to force the application to exit, or wait for it to respond?"

Additional notes

No response

[christianparpart]

On a very quick look, the GUI thread (Qt) and the Terminal I/O thread both try to acquire the lock on the terminal object and wait. This is the freeze I also noticed. What I could not figure out in an instant is why both wait, as in, who's holding the lock. Good question. Many thanks, @j4james. We'll investigate that. This used to work. I wonder if it's possible to add it to our headless integration test suite. 🤔