Bug#821354: gnome-settings-daemon: tap-to-click seems to work also with xserver-xorg-input-synaptic

[Antos Andras]

Package: gnome-settings-daemon
Version: 3.20.1-2
Followup-For: Bug #821354

Dear Michael,

Just to let you know: I do not have xserver-xorg-input-libinput installed 
and indeed tap-to-click cannot be configured either via 
gnome-control-center or gnome-tweak-tools, and does not become effective 
inspite of being true in dconf-editor or gsettings.
However, I could make it work by
$ synclient TapButton1=1 TapButton2=3 TapButton3=2
still without installing xserver-xorg-input-libinput.

By the way, is/will xserver-xorg-input-synaptic and 
xserver-xorg-input-evdev be deprecated by xserver-xorg-input-libinput? 
Which ones are recommended to install in Debian 9?

Thank you,
Andras

-- System Information:
The touchpad hardware model:

$ egrep -i 'synap|alps|etps' /proc/bus/input/devices
N: Name="ETPS/2 Elantech Touchpad"

ii  xserver-xorg-input-evdev              1:2.10.2-1
ii  xserver-xorg-input-synaptics          1.8.3-2
un  xserver-xorg-input-libinput           <none>

Debian Release: stretch/sid
   APT prefers testing
   APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.6.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnome-settings-daemon depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.0-1
ii  gsettings-desktop-schemas                    3.20.0-3
ii  libasound2                                   1.1.1-2
ii  libc6                                        2.22-11
ii  libcairo2                                    1.14.6-1+b1
ii  libcanberra-gtk3-0                           0.30-3
ii  libcanberra0                                 0.30-3
ii  libcolord2                                   1.3.2-1
ii  libcups2                                     2.1.4-1
ii  libfontconfig1                               2.11.0-6.4
ii  libgdk-pixbuf2.0-0                           2.34.0-1
ii  libgeoclue-2-0                               2.4.3-1
ii  libgeocode-glib0                             3.20.1-1
ii  libglib2.0-0                                 2.48.1-1
ii  libgnome-desktop-3-12                        3.20.2-1
ii  libgtk-3-0                                   3.20.6-1
ii  libgudev-1.0-0                               230-3
ii  libgweather-3-6                              3.20.1-1
ii  liblcms2-2                                   2.7-1
ii  libnm0                                       1.2.2-2
ii  libnotify4                                   0.7.6-2
ii  libnspr4                                     2:4.12-2
ii  libnss3                                      2:3.23-2
ii  libpam-systemd                               230-2
ii  libpango-1.0-0                               1.40.1-1
ii  libpangocairo-1.0-0                          1.40.1-1
ii  libpolkit-gobject-1-0                        0.105-15
ii  libpulse-mainloop-glib0                      8.0-2+b2
ii  libpulse0                                    8.0-2+b2
ii  librsvg2-2                                   2.40.16-1
ii  libupower-glib3                              0.99.4-3
ii  libwacom2                                    0.19-1
ii  libwayland-client0                           1.11.0-2
ii  libx11-6                                     2:1.6.3-1
ii  libxext6                                     2:1.3.3-1
ii  libxi6                                       2:1.7.6-1
ii  libxtst6                                     2:1.2.2-1+b1
ii  nautilus-data                                3.20.1-3

Versions of packages gnome-settings-daemon recommends:
pn  iio-sensor-proxy  <none>
ii  pulseaudio        8.0-2+b2