BTW: Could you please tell me advantages of storing fixed sizes instead of
fractions?? IMHO there aren't any....but maybe...
A fixed size edit window might be useful if you have a styleguide saying
each line should be bound to 80 characters to support a broad range of
monitors and printers. I personally prefer opening Emacs in a fixed size
and avoid changing this size, so relative sizes of ECB buffers will do.