bug#28512: 26.0.60; undecorated frames on macOS 10.13 do not resize properly

[Aaron Jensen]

Hi Alan,

I was able to get some information from the author of iTerm2. The
problem is definitely that Emacs changes the window style to
resizable. If the NSWindow is recreated as resizable then it works
fine.

So that leaves a couple of questions:

1. Is it possible to create the first frame with undecorated set?
2. Would it be difficult to recreate the NSWindow housing the frame
when that frame parameter is changed?

Thanks,

Aaron