bug#35435: 26.1; Gnome magnifier not following cursor when typing in emacs

[Eli Zaretskii]

> From: Eric Danan <eric.danan@u-cergy.fr>
> Date: Fri, 26 Apr 2019 13:05:41 +0200
> 
> Due to a visual impairment I constantly work with a screen magnifier 
> turned on (in full screen mode), and I need it to track the cursor/caret 
> to follow what I am typing.
> 
> So far I am using emacs 26.1 on cygwin on windows 10, and the windows 10 
> magnifier does the job of tracking the cursor.
> 
> I am considering switching to gnome on linux and therefore installed the 
> fedora (version 29) distribution to try it out. The gnome (3.30) shell 
> magnifier supports cursor tracking and it works in other applications 
> but not emacs (26.1).
> 
> I previously sent this message to the gnome accessibility list (that was 
> a long time ago in 2015, so with earlier versions of emacs and gnome) 
> and got a reply from Alex Arnaud stating:
> 
>  > I've tried to test Emacs with Accercicer (a accessibility debug tool) 
> and my conclusion are Emacs doesn't connect it to AT-SPI (accessibility 
> stack).

The Windows port of Emacs has special code to move the system caret in
sync with the cursor.  I guess the X build should have something
similar, patches are welcome to implement that.