In case anyone else hates the way VLC Player auto re-sizes the window, there is a setting buried deep that allows you to keep it one size.
Untick the 'Resize interface to the native video size' option in:
Tools -> Preferences (Show settings: All) -> Interface -> Main interfaces -> Qt
Untick the 'Resize interface to the native video size' option in:
Tools -> Preferences (Show settings: All) -> Interface -> Main interfaces -> Qt
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