Cursor droppings in WT cmd shell

[j4james]

Windows Terminal version

Commmit 75f7ae4

Windows build number

10.0.19045.4651

Other Software

No response

Steps to reproduce

I don't know how many of these steps are strictly required, but this is what reproduces the issue for me quite consistently:

1. Open a cmd shell in Windows Terminal.
2. Create a directory with 6 files in it.
3. Make sure the screen height is 24 rows.
4. Clear the screen with cls.
5. Execute dir twice in a row.

Expected Behavior

Only one instance of the cursor should be visible on the screen.

Actual Behavior

There is an extra zombie cursor dropping left after the second dir is typed.

It happens quite consistently for me, but not every time, and it disappears quite easily - switching to another window and back again is usually enough. That made it very difficult to screenshot. I had to take a video and save one of the frames.

I can't reproduce it in the preview build (1.21.1272.0), so I'm assuming it's a regression. I'll try and do a git bisect later to see if I can figure out the exact commit.

[j4james]

It looks like commit 0a2b660 is the cause.

[DHowett]

Thanks for bisecting, James!