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

[YAMAMOTO Mitsuharu]

>>>>> On Fri, 25 Dec 2009 12:26:31 +0100, martin rudalics <rudalics@gmx.at> 
>>>>> said:

>> 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.

In the case of the `font' frame parameter, it does the adjustment of
the number of rows/columns on its change.

  1. emacs -Q
  2. (set-frame-parameter nil 'fullscreen 'fullboth) C-j
  3. (frame-parameter nil 'width) C-j   [which gives 176 for me]
  4. (set-frame-parameter nil 'font "-*-courier-*--20-*") C-j
  5. (frame-parameter nil 'width) C-j   [which gives 112 for me]

So I think the reported issue was simply overlooked rather than by
intention.

                                     YAMAMOTO Mitsuharu
                                mituharu@math.s.chiba-u.ac.jp