Ghostly cursor droppings in OpenConsole

[j4james]

Windows Terminal version

Commit e826203

Windows build number

10.0.19045.4412

Other Software

No response

Steps to reproduce

1. Build a recent commit of OpenConsole.
2. Start a cmd shell.
3. Set the cursor shape to Solid Block so it's easy to see.
4. Hold down Enter and let the viewport scroll for a while.

Expected Behavior

You should only see the cursor on the last prompt of the page.

Actual Behavior

After a short while, you'll start to see a trail of ghostly cursor droppings left behind on most of the lines. They don't look like the full cursor droppings we've had in the past though - they seem to be about 25% of the usual brightness.

[github-actions]

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[j4james]

This looks like it regressed in 4fbcd65. I don't have time to investigate now, but if I remember correctly the GDI engine used to have some special case handling for the cursor when scrolling, so that might have something to do with this. The problem doesn't occur if the Atlas engine is used.