[quartz] GdkWindow, GdkNSView frame and cairo surface same size.

[quartz] GdkWindow, GdkNSView frame and cairo surface same size.

The cairo surface must be padded to 4 pixels in order to
transfer correctly to the GPU. The GdkWindow and GdkNSView's
content frame must be the same width, otherwise there's a mismatch
that causes either the GdkWindow to draw wider than the frame or the
frame to be clipped narrower than the title bar.

Fixes #5535.