bug#5268: 23.1.90; # of rows/columns not adjusted by change of internal-border-width for fullscreen frames

[martin rudalics]

>   2. (set-frame-parameter nil 'fullscreen 'fullboth) C-j
>   3. (set-frame-parameter nil 'internal-border-width 30) C-j
>
> Result:
>
>   The echo area does not fit in the screen and becomes invisible.
>   The number of rows/columns seems to be unchanged by Step 3.

I suppose that's by intention.  If I do

(set-frame-parameter nil 'internal-border-width 0)

afterwards, the frame shrinks (probably in order to keep the number of
lines and columns constant).  Fullscreen mode is inherently incompatible
with the "keep the number of lines/columns constant" paradigm permeating
many of the frame and font size handling routines.

martin