Maximum size for main window
I have seen that vlc resizes the main window to the size of the last video which was opened.
The maximum size of the window should be limited to the screen resolution available. In current state, when you open an 1080p file on a screen with do not have so much pixels in width and / or height, at the next launch the window will be equally big and project beyond the screen resolution.
Actually, it could be reconsidered if sizing the window to the last video size is such a good idea. Perhaps the size should only be saved after a resize done the user...