Enumerate windows like alt-tab does

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Raymond Chen answered this a while back
(https://devblogs.microsoft.com/oldnewthing/20071008-00/?p=24863):

It’s actually pretty simple although
hardly anything you’d be able to guess
on your own. Note: The details of this
algorithm are an implementation
detail. It can change at any time, so
don’t rely on it. In fact, it already
changed with Flip and Flip3D; I’m just
talking about the Classic Alt+Tab
window here.

For each visible window, walk up its
owner chain until you find the root
owner. Then walk back down the visible
last active popup chain until you find
a visible window. If you’re back to
where you’re started, then put the
window in the Alt+Tab list. In
pseudo-code:

BOOL IsAltTabWindow(HWND hwnd)
{
 // Start at the root owner
 HWND hwndWalk = GetAncestor(hwnd, GA_ROOTOWNER);

 // See if we are the last active visible popup
 HWND hwndTry;
 while ((hwndTry = GetLastActivePopup(hwndWalk)) != hwndTry) {
  if (IsWindowVisible(hwndTry)) break;
  hwndWalk = hwndTry;
 }
 return hwndWalk == hwnd;
}

Follow the link to Chen’s blog entry for more details and some corner conditions.

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