[Cin] Not quite correct patch for toggling various windows from mainmenu->window submenu

[Phyllis Smith]

Andrew,
This patch has been tested on my laptop and I did not encounter a problem.
Is there still a problem with this "Not quite correct patch"? so that it
should not be checked into GIT?

Well, I'm fairly sure
>
> void MWindow::hide_vwindow() kinda wrong (because copypasta!)
>
> but it seems to work for single viewer window I wanted to hide via  this
> menu.
>
>
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