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[Hawkwind]

I realised that the 'present' method is not doing a 'vsync' (if set) when the
display window is not visible.

This may be ok. when rendering to just one window, however I have two
windows and the end of my display loop does a 'Present' for each one.
Obviously I only set 'vsync' for the last window to be presented.

The problem is then that if the last window is obscured (for example I drag
something on top of it on the display) then no vsync is acknowledged and
the frame rate goes ballistic on the other window.

Q.) How can I ensure that a vsync gets done ?

Furthermore (and this is surely a bug), it appears that the ignoring of the vsync happens only when the entire window is obscured (including borders and title bar) and not just the active area.

Hmmm....