[Bug]: Docking frames outside of main windows looks funky

[Tdue21]

Describe the Bug

With a multiple monitor setup, it is possible to place frames etc. outside of the main window for maximizing map viewport. The result is less than aesthetical pleasing to look at.

I realize it is probably an artifact of the docking system, but hopefully something that can be tweaked by someone than actually understands Java (i.e. not me ;) ).

When two or more frames are docked together outside of the main windows, they are first framed by a Windows XP looking inner window, and then the native window (Windows 10, in my case).

To Reproduce

Steps to reproduce the behavior:

1. Drag two frames outside of the main window
2. Dock the two frames together.
3. Observe a funky looking window.

Expected Behaviour

Basically what happens now, but without the extra Windows XP looking inner window.

Screenshots

MapTool Info

1.11.5

Desktop

Windows 10

Additional Context

No response