In high DPI, we have to disable differential drawing.
This is because the text is drawn at fractional pixel heights and baselines automatically as we're scaling the entire d2d render target. The fractional drawing is also making it look a little bit off for High DPI customers.

So doing the work of removing the implicit scaling and installing our own transforms on the origins and sizes of the five things we draw should resolve this issue:

1. Clear background rectangles
2. The cursor
3. Selection rectangles
4. The background color behind text
5. Text runs