Re: [Patch]: Allow overlay arrows to be inserted before the text at column zero rather than splatting it.

[Alan Mackenzie]

Hello again, Eli.

On Sun, Aug 18, 2019 at 21:53:23 +0300, Eli Zaretskii wrote:
> > Date: Sun, 18 Aug 2019 18:43:56 +0000
> > Cc: address@hidden
> > From: Alan Mackenzie <address@hidden>

> > I don't think there's anything else in Emacs at the moment that could
> > take its place.  The essence here is being able to insert "=>" onto the
> > display _without_ disturbing the horizontal alignment

> Sorry, I'm confused now: how can you insert the arrow without either
> moving the rest of the line to the right or overwriting its first few
> glyphs?  Where does the space for the arrow come from?

Sorry for being a bit inexact.  In that bit I meant inserting "=>" by
overwriting the two characters in columns 0 and 1.  We need to be able
to do this.

At the moment, I don't think Emacs can do this without using the
(current) overlay arrow facility.

-- 
Alan Mackenzie (Nuremberg, Germany).