Terminal sticky scroll can show up for 1 frame when using page down in a pager

[Tyriar]

Repro:

1. On Windows
2. Enable sticky scroll
3. Open pwsh
4. Run git diff with more than a page of changes
5. Page up+down, 🐛 sticky scroll will show up for 1 frame every time page down is used

It rarely shows up in the gif due to low recording framerate

[Tyriar]

May get fixed with conpty v2 #224488

[anthonykim1]

Able to repro this, I think this is Windows only though:

Windows ( Flash, repro):

FlashRepro.mov

Mac (No flash, No repro):

macStickyNoFlash.mov