Glitches caused by large number of color combinations

[willmcgugan]

xterm will blank out parts of the terminal when writing a large amount of color escape sequences.

To reproduce, download this file:

colors.txt

cat the contents in VSCode. You should see a spectrum of colors like the following:

But if you hit a key, you should see that much of the content disappears. Resizing the window often makes it come back.

Occasionally this also results in the following glitch.

I suspect this is the root cause of #4480

Details

• Browser and browser version:
• OS version: macOS 13.3.1 (22E261)
• xterm.js version: VSCode Version: 1.77.3

[jerch]

@willmcgugan Cannot repro this one in the xterm.js demo under linux/chrome/firefox with any renderer (always get the full "image"), still the other issue #4480 repros here as well (in chrome/firefox with canvas/webgl renderer).

Are there additional steps to do in between to get into the broken output? (Tried several things, like ls and mc output, before getting back to the colors file.)

[willmcgugan]

Sorry for the delay. I can't reproduce it on the latest VSCode now. But I can create a glitch that looks very similar.

If I run this command a few times, it will often end up with corrupted textures.

python -m rich.palette

It seems stress related. But if I repeat the above command, I get the following:

Screen.Recording.2023-07-15.at.18.11.28.mov

Oddly, typing reset actually restores the terminal to a usable state.

[jerch]

@willmcgugan I think thats related to #4534 - the atlas get corrupted at higher pressure (and yeah reset would also clean the atlas).