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

From: Eric Danan
Subject: bug#35435: 26.1; Gnome magnifier not following cursor when typing in emacs
Date: Mon, 3 Feb 2020 10:49:15 +0000
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.4.2


For the record, it seems that cursor tracking does not work with the Mac OS magnifier ("zoom") either when typing in Emacs. I tested this with a Mac OS 10.15 virtual machine and installing Emacs from the following sources:

* emacsformacosx.com

* Homebrew:
** brew cask install emacs: I was not able to complete the installation for some reason but it is the same as emacsformacosx.com if I understand correctly
** brew install emacs-plus
** brew install emacs-mac

* Mac Ports
** sudo port install emacs-app
** sudo port install emacs-app-devel
** sudo port install emacs-mac-app

On the other hand, cursor tracking worked correctly in e.g. the Safari browser. So I guess the Mac port of Emacs does not have the "special code to move the system caret in sync with the cursor" that the Windows port has.


On 2019-05-02 09:17, Eric Danan wrote:
Thanks for your reply. I don't have the knowledge (neither on the emacs code nor on X) to prepare such a patch, and I of course understand if no one else can do it, but I an otherwise happy to test things if that can help.

(Also cc'ing Alex Arnaud, which I forgot to do the first time.)

On 2019-04-26 13:14, Eli Zaretskii wrote:
From: Eric Danan <address@hidden>
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

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.

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