Clicking very edge of program window clicks to window behind

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### System Information

Windows 10

### LMMS Version(s)

1.3.0-alpha.1.687+g35f350eef

### Most Recent Working Version

_No response_

### Bug Summary

If you click in the very edge of the LMMS window (for example, bringing your mouse as far right as it can go on the monitor), it will instead register to clicking whatever window you may have behind it (also pulling it up). Very annoying when trying to click the close button on maximized in-program things (like the piano roll), and possibly devastating if the window behind has something bad to click right behind

### Expected Behaviour

it doesn't do that

### Steps To Reproduce

click in the very edge of the LMMS window (for example, bringing your mouse as far right as it can go on the monitor)
I don't know if this is a problem when not maximized but idk who's using this not maximized

### Logs

_No response_

### Screenshots / Minimum Reproducible Project

_No response_

### Please search the issue tracker for existing bug reports before submitting your own.

- [X] I have searched all existing issues and confirmed that this is not a duplicate.

Reproduce the edge-click behavior on Windows 10 with LMMS 1.3.0-alpha.1.687+g35f350eef, especially while maximized and an in-program window such as the piano roll is open. Trace the desktop window and mouse-input handling; done means clicks at the extreme window edge stay within LMMS and no window behind it is activated.

Written by the indexing model from the issue text.