Opcode tooltip scaling and positioning for multi-dpi displays

[pawchen]

Steps to reproduce

1. OS: Win10 21H2 64-bit
2. Two monitors, 4k 175% on the left, 2K 100% on the right, the left set as main display
3. Arrangement
   
4. ILSpy starts at Display 1
5. Drag it to Display 2
6. Switch language to IL
7. Load some dll and hover over the opcode
8. The Tooltip show up at the bottom right corner of the screen, instead of under cursor.
9. Also the tooltip scaling is wrong.
10. Screenshot
    

Details

ILSpy version 7.2.1.6856
.NET version 4.8.4536.0