Secondary window is glitched when using OpenGL display on Windows and melonDS 1.0RC

[davidmorom]

On Windows and melonDS 1.0RC, the function to open a secondary window (View-> Open new window) only works fine if using software rendering mode without OpenGL display. If enabling OpenGL display with software rendering mode, or using OpenGL or OpenGL compute shader rendering modes, the display on the secondary window is glitched and the menu bar is unusable.