Jumping main window

[gitowiec]

Describe the bug Dosbox-x's main application window jumps to the center of the desktop when having my laptop connected to the external monitor.

To Reproduce Steps to reproduce the behavior:

1. Go to the Video menu
2. Click on the Scaler
3. Choose Normal 3X or Normal 4X or whatever
4. See the error

Expected behavior The application windows stay intact in the same position user set it.

Screenshots https://user-images.githubusercontent.com/1553195/111925529-8aefa780-8aa9-11eb-8e48-b65fb1dcdde6.mp4

Environment (please complete the following information):

• Operating systemL Ubuntu Budgie 20.04
• DOSBox-X release version: 0.83.11 (SDL1, 64-bit) Build date/time: Mar 1, 2021 12:01:07am
• Used configuration, e.g. dosbox-x.conf - it is fresh install, no configuration changed

[Wengier]

Without a windowposition= setting, DOSBox-X tries to center its window on the screen in such cases, and in your dual-screen setup DOSBox-X appears to move it windows towards the middle. Please try set the windowposition= option and see if it helps.