> The hook `window-size-change-functions' is not executed when a frame is
 > manually resized.
 >
 > In Emacs 23 it was called, but in Emacs 24 and Emacs 25 it isn't.
 >
 > For example, this break the package Follow mode, its windows are not
 > aligned after the frame has been resized.

If no one objects I intend to install the attached patch on Emacs-25.
Anders please confirm that it fixes the problem.

Thanks, martin