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

From: Jan Djärv
Subject: bug#7004: 23.2; In fullscreen mode, the echo area takes too much vertical space
Date: Mon, 13 Sep 2010 22:48:59 +0200
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv: Gecko/20100825 Thunderbird/3.1.3

Eli Zaretskii skrev 2010-09-13 21.18:
Date: Mon, 13 Sep 2010 20:59:27 +0200
From: Jan Djärv<address@hidden>
CC: address@hidden, address@hidden

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

Yes, but when the new size is communicated Emacs reacts to the new frame size with change_frame_size, and then windows are also resized.

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.

On X Emacs also just uses what its got. But I don't understand how a window can be made not an integral if the font size. The only thing that is externally resized is the frame. Windows, mode lines and minibuffer are handeled, resized and positioned by Emacs. I just can't find any way to resize/position those based on anything except increments of the font size.

        Jan D.

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