HostWindowPlugin does not account for window decorations on resize

[marceltaeumel]

VM: 201608171728 (Cog, Spur)
HostWindowPlugin: VMMaker.oscog-eem.1716 (i)
Platform: Windows 10 1607, OS X El Capitan 10.11.6

If you call the named primitive primitiveHostWindowSizeSet, the Display will not have the correct size after the call.

Try it in Squeak 5.1rc1:

DisplayScreen
   hostWindowExtent: 800@600;
   checkForNewScreenSize.
self assert: Project current world extent = (800@600).

In Squeak, there is a image-side workaround for that in DisplayScreen >> #setNewScreenSize:, which calculates the difference and then calls the primitive again.

On OS X the bug seems to affect only the window title bar and hence only the height. On Windows 10 also the left/right shadows interfere and hence both height and width are wrong.

This bug affects both the 32-bit and the 64-bit versions.

[eliotmiranda]

I finally fixed this in d990bfd