Memory leak with several ANSI sequences

[ZEDCWT]

Environment

Windows build number: 10.0.19042.508
Windows Terminal version (if applicable): 1.5.3142.0

Any other software?
Node v15.2.0

Steps to reproduce

• Save the following content in a file, say, name it with test.js

var readline = require('readline'),count = 0;
setInterval(() =>
{
	console.log(++count,new Date)
	readline.moveCursor(process.stdout,0,-1)
},10)

• Open the cmd.exe in the terminal
• Run the script saved above with path\to\node.exe path\to\test.js

Expected behavior

No significant memory increasing should be observed

Actual behavior

To compare with, another cmd.exe is also directly started by Win+R and run the same script.
Here is the initial memory usage

Also, reported by Process Explorer, the WS Private and Working Set are

WindowsTerminal.exe	36976 K	101816 K

Then, leave them run for hours, and here is the memory usage after the counter hit 400k+.

Next, Ctrl+C to end both node processes, and wait for 5min.

WindowsTerminal.exe	96444 K	157840 K

It seems that it memory leaked.
And by roughly counting during the progress, the memory usage grow about 0.1 MB / 10 sec.

[DHowett]

Hmm, you're right. Interesting.

[DHowett]

Good catch!

[ghost]

🎉This issue was addressed in #8618, which has now been successfully released as Windows Terminal Preview v1.6.10272.0.:tada:

Handy links:

• Release Notes
• Store Download