Bug: Window Jumps up after exiting Fullscreen (on Windows)

[blackCrunch307]

Description
On Windows, after exiting Fullscreen, the window jumps up by a few pixels compared to what it was before Fullscreen was entered.

To Reproduce
Steps to reproduce the behavior:

1. Start emulator
2. Start a machine
3. Enter, then exit Fullscreen
4. The emulator window will have jumped up by a few pixels.

Expected behavior
The emulator, upon exiting Fullscreen, should return to the space it previously occupied.

Demonstration
See below video:
https://user-images.githubusercontent.com/73771471/125551009-21cbab2a-0213-429e-bab9-8e5f00444936.mp4

Emulator configuration
N/A

Host machine

• OS: Windows 10, 11 (haven't tested other versions)
• Emulator version: v17

[unreal9010]

I can confirm that. It's been happening since v16. Sometimes (if you switch between fullscreen and windowed mode several times in a row) the window goes so up that the menu items become inaccessible.

[leilei-]

It's been happening for me in certain configs with resizable windows, since it'll keep saving the pushed up size and repeating the bug. Grabbing the resize handle will bring it back down to usable position