bug#7004: 23.2; In fullscreen mode, the echo area takes too much vertical space

[Eli Zaretskii]

> Date: Mon, 13 Sep 2010 20:59:27 +0200
> From: Jan Djärv <jan.h.d@swipnet.se>
> CC: david@harpegolden.net, 7004@debbugs.gnu.org
> 
> The resizing is constrained to increments of the font size, so it is not 
> possible to resize it manually to a fraction of the font size.
> If we remove that constraint by editing the source it will show the same 
> behavour, extra pixels are unused at the bottom of the frame.

So it's probably some detail of how the windows are redisplayed that
leaves the mini-window with the extra space, instead of giving it to
the previous window.

> But I don't know of any function that sizes a window by pixels.  All the 
> resizing code does is to calculate rows and columns from the pixel sizes and 
> the call change_frame_size.  That in turn resizes windows, but just based on 
> lines and columns, not pixels AFAIK.

Doesn't the fullscreen option on X resize _the_frame_ instead of
windows?

> I see that W32 does that also, so how can it be different?

On Windows, the fullscreen I tried was by sending a special command to
the window manager.  I'm guessing that this resizes the frame, and
then Emacs's redisplay simply uses what it's got.  I will have to look
at the sources to see if my guess is correct.