Examples behaving weirdly on resize

[bvssvni]

This seems to happen only with Glutin on OSX.

[kvark]

Dupe of #206?

[bvssvni]

I'm updating the size in piston_window. Need to investigate this closer.

[kvark]

I see.

[bvssvni]

This is not a problem on SDL2.

[bvssvni]

This is still a problem when using Glutin.

[bvssvni]

I have managed to replicate the bug by modifying the piston-examples/image to use gfx_graphics on both Glutin and SDL2. Suspecting this got something to do with setting up viewport correctly on resize.

[bvssvni]

This is probably caused by Glutin not receiving resize events on OSX.

[kvark]

Thanks @bvssvni this explains it. I'm still not a fan of using "fake" output though.