RE: [PATCH] Implement functions for measuring fonts and max chars per line

[Drew Adams]

> What I want is to know (by calculation) what the maximum height, in
> lines, happens to be so I can shove that in for 'height in
> default-frame-alist. (There are other uses for such information of
> course, see above.)

The max height in pixels is `x-display-pixel-height'.

Divide that by the value returned by `frame-char-height' for your
frame, or by whatever character height you intend to use, if
you know it, to find the number of lines possible for the display.

But that does not count the space needed for these things:

1. menu-bar - you can approximate this by 
`(frame-parameter nil 'menu-bar-lines)'.

2. tool-bar - similar: `tool-bar-lines'.

3. height of the window-mgr title bar and bottom border.

4. any other window-mgr stuff that is outside Emacs's
visibility & control.

So proceeding this way you need to do a little estimating,
especially wrt window-mgr stuff.