Re: Better handling of window margins

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 04 Dec 2015 17:56:14 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: joostkremers@fastmail.fm, emacs-devel@gnu.org
> 
>  > I agree.  But if we only care about showing the same buffer case, then
>  > we do really need to consider only the width of the text area when we
>  > decide whether to split horizontally or vertically, right?  Moreover,
>  > even when another buffer is shown in one of the two windows, the
>  > window that continues to display the original buffer should still have
>  > reasonable width of its text area, right?  And the only way to
>  > guarantee the latter is to consider the width of only the text area,
>  > excluding the margins.
> 
> I miss you here.  This discussion started with the problem that while
> modes are able to readjust their margins when a window is split,
> ‘split-window-sensibly’ won't split the window because it looks only at
> the width of the text area.  C-x 3 would fail in the same manner because
> it would compare ‘window-min-width’ (whose "value has to accommodate two
> text columns as well as margins, fringes, a scroll bar and a right
> divider, if present") with a text only area.

"C-x 3" should compare window-min-width with the size of the text area
only.

>  >>   > We are still talking about splitting windows here, right?
>  >>
>  >> And about resizing windows, right?
>  >
>  > I wasn't aware that resizing windows was part of the use cases
>  > considered by this discussion.  How is it relevant?  What decisions
>  > during resizing depend on the margins?
> 
> When I split a window I have to shrink the original one.  When I have
> two side by side window and want to enlarge one of them I have to shrink
> the other one.  So we have to solve the same problem in both cases.

What problem is that?

The problem we need to solve in the split-window case is whether to
split vertically or horizontally.  There's no such problem when
resizing a window.

If you mean the problem when to refuse the resize because the window
is too small, then yes, it should also look at the size of the text
area alone.