Tried it out one more time, not sure if something has changed with 3.3, but I hacked on that sample and it kinda works.

If I adjust the height of the window, then it will resize the window if the size of the window isn't the "minimum" size for that aspect ratio.

My resolution is 1280x800, the minimum size appears to be 960x622 (600, 22 pixels for the title bar). So it looks like the minimum size is 75% of the resolution... until you try 800x600, which is 800x600.

Of course... it depends also on which of the graphics APIs you're using.

In 3.3 Blizzard re-did the window hosting which allowed us to resize the windows smaller than before, but introduced some horrible lag (not sure if that is fixed yet).

If us Mac users have set the SET gxapi "OpenGL" option in our on Config.wtf, then we're constrained by the original functionality (which I could have sworn didn't work pre-3.3 anyway).

If we don't have that flag set in the Config.wtf then we can size the windows better.

1280x800 -> 768x502(480)
800x600 -> 640x502(480)

So... it might be back on the table!