Bug#731429: gdm3: Set up tap to click by default

[Francois Gouget]

This bug is still present in gdm3 3.18.

After many false leads I found how to enable tap-to-click in gdm3 in the 
GNOME bug below:

Bug 747811 - Mouse settings not getting propagated to GDM 
https://bugzilla.gnome.org/show_bug.cgi?id=747811

The instructions need slight adjustments so here they are for Debian:

    $ xhost +SI:localuser:Debian-gdm
    $ su
    <type-your-password>
    # DISPLAY=:0 sudo -u gdm gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click true

I'm not sure why the access permissions of the logged in user are 
relevant to the gdm3 configuration but they proved essential. Of course 
you'd immediately cancel the effect of the xhost command, typically by 
logging out and back in. Plus you want to test that tap-to-click anyway, 
right?


I thought this could easily be turned into a way to enable 
tap-to-click by default, simply by putting the relevant dconf 
setting in /usr/share/gdm/dconf/50-tap-to-click as follows:

cat >/usr/share/gdm/dconf/50-tap-to-click <<EOF
[org/gnome/desktop/peripherals/touchpad]
tap-to-click='true'
EOF

But that did not have any effect. Not sure why. If anybody knows I'm all 
ears.


-- 
Francois Gouget <fgouget at free.fr>              http://fgouget.free.fr/
            "Lotto: A tax on people who are bad at math." -- unknown
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