Re: feature/icomplete-vertical

[Gregory Heytings via "Emacs development discussions." <emacs-devel@gnu.org>]

>> If so, is there a "canonical" way to perform these calculations that 
>> accounts for fontsizes, frame widths, etc?  To be clear, I find this 
>> information useful for other domais, notably designing the way the 
>> Eldoc should show information in the echo area.
>
> Not sure what should be canonical here.  AFAIU, just using 
> window-text-pixel-size and comparing with the window dimensions is all 
> that's needed.
>

Just calculating the window dimensions is already a nontrivial task. 
There are two cases: a miniwindow-only frame, and the "normal" case.  In 
the first case you need to use frame-height, and multiply it with the 
pixel height of the "default" face.  In the second case you can get the 
maximal dimensions with max-mini-window-height, and multiply it by the 
pixel height of the "default" face.  But you cannot just multiply 
max-mini-window-height by that height, that would be too easy.  There are 
again two cases: either max-mini-window-height is an integer, in which 
case you can just do that multiplication, or it is a floating point 
number, in which case you have to multiply that number by frame-height and 
truncate it, and multiply the resulting number by the pixel height of the 
"default" face...