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bug#37213: Execute set-window-margins. left-margin-width remains 0.
From: |
Alan Mackenzie |
Subject: |
bug#37213: Execute set-window-margins. left-margin-width remains 0. |
Date: |
Sun, 1 Sep 2019 12:42:45 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
Hello, Martin.
On Sun, Sep 01, 2019 at 14:19:37 +0200, martin rudalics wrote:
> > OK. It seems there are two alternative strategies for manipulating a
> > window's margins. One is to use set-window-margins together with
> > window-margins, the other is to use left/right-margin-width and
> > set-window-buffer.
> Right. With fringes and scroll bars you can additionally set a frame
> parameter. I know that you're not interested in the latter but any
> descriptions should be consistent.
None of this is simple.
> >> Hmm... What is the "current width of the left or right margin"?
> > I'm not sure I understand the question. In a given window with a left
> > margin, there will be a maximum length of string which can be displayed
> > in that margin. That is its "current width". The same for a right
> > margin. What are you getting at, here?
> That you omitted the "In a given window" preamble in the manual. When
> you have a frame with two windows showing one and the same buffer, the
> margins of these windows can have different widths. What would be the
> "current width" in that case?
Whatever it is, you can't get it reliably from left/right-margin-width.
You can get it by calling window-margins, and as window-margins takes a
window as a mandatory argument, that surely answers the question.
The point about the extra text I put in is to emphasise that Emacs does
not update left/right-margin-width to reflect the current width (in
whatever sense). The former text was not clear about this point.
I don't think the current text needs further amendment. If you
disagree, perhaps you could propose a specific change.
> martin
--
Alan Mackenzie (Nuremberg, Germany).