Bug#839734: cc-display-panel: 3 connected monitors (switching from 1 display to 2 often impossible)

[Manonam]

Package: gnome-control-center
Version: 1:3.22.0-1
Severity: normal

Dear Maintainer,

   * What led up to the situation?
I have 3 monitors connected (1 DVI [main], 1 HDMI [TV], 1 VGA [small]). I
cannot use all of them at once, but most often two at a time (I don't use
"Clone" but "Secondary"). ([main], or [main]+[TV], or [main]+[small]). But
sometimes when I want to switch from [main] to [main]+[small], the change is
not possible because the [TV] is in between.
Visually as "arrange combined monitors" shows: [small][TV][main], and I would
want [TV][main][small]. But the thing is I cannot access "arrange combined
monitors" until they are 2 active monitors...

   * What exactly did you do (or not do) that was effective (or
     ineffective)?
The workaround I have found is to first switch on the [TV], then access the
"arrange combined monitors" to put the [small] where I want it (edge-to-edge
with [main]), then switch off the [TV], and switch on the [small]...

   * What was the outcome of this action?
OK

   * What outcome did you expect instead?
I would like to be able to access "arrange combined monitors" before. maybe add
a rule as if (num_monitors >=3) then show the "arrange combined monitors" ? so
that one can first fix the arrangement before applying resolution change.
(More generally, I find annoying to have to first select a secondary display
and apply the changes, THEN access "arrange combined monitors" to put it where
you want and apply again the changes.)

Thank you !!




-- System Information:
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=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnome-control-center depends on:
ii  accountsservice            0.6.40-3
ii  apg                        2.2.3.dfsg.1-4
ii  colord                     1.3.3-2
ii  desktop-file-utils         0.23-1
ii  gnome-control-center-data  1:3.22.0-1
ii  gnome-desktop3-data        3.22.0-1
ii  gnome-settings-daemon      3.22.0-1
ii  gsettings-desktop-schemas  3.22.0-1
ii  libaccountsservice0        0.6.40-3
ii  libatk1.0-0                2.22.0-1
ii  libc6                      2.24-3
ii  libcairo-gobject2          1.14.6-1+b1
ii  libcairo2                  1.14.6-1+b1
ii  libcanberra-gtk3-0         0.30-3
ii  libcanberra0               0.30-3
ii  libcheese-gtk25            3.22.0-1
ii  libcheese8                 3.22.0-1
ii  libclutter-1.0-0           1.26.0-2
ii  libclutter-gtk-1.0-0       1.8.2-1
ii  libcolord-gtk1             0.1.26-1
ii  libcolord2                 1.3.3-2
ii  libcups2                   2.2.0-2
ii  libfontconfig1             2.11.0-6.7
ii  libgdk-pixbuf2.0-0         2.36.0-1
ii  libglib2.0-0               2.50.0-1
ii  libgnome-bluetooth13       3.20.0-1
ii  libgnome-desktop-3-12      3.22.0-1
ii  libgoa-1.0-0b              3.22.0-1
ii  libgoa-backend-1.0-1       3.22.0-1
ii  libgrilo-0.3-0             0.3.2-2
ii  libgtk-3-0                 3.22.0-1
ii  libgtop-2.0-10             2.34.1-2
ii  libgudev-1.0-0             230-3
ii  libibus-1.0-5              1.5.11-1
ii  libkrb5-3                  1.14.3+dfsg-2
ii  libmm-glib0                1.6.2-1
ii  libnm0                     1.4.0-4
ii  libnma0                    1.4.0-2
ii  libpango-1.0-0             1.40.3-2
ii  libpangocairo-1.0-0        1.40.3-2
ii  libpolkit-gobject-1-0      0.105-16
ii  libpulse-mainloop-glib0    9.0-3
ii  libpulse0                  9.0-3
ii  libpwquality1              1.3.0-1
ii  libsmbclient               2:4.4.5+dfsg-3
ii  libsoup2.4-1               2.56.0-1
ii  libupower-glib3            0.99.4-4
ii  libwacom2                  0.22-1
ii  libx11-6                   2:1.6.3-1
ii  libxi6                     2:1.7.6-1
ii  libxml2                    2.9.4+dfsg1-2

Versions of packages gnome-control-center recommends:
ii  cracklib-runtime              2.9.2-3
ii  cups-pk-helper                0.2.6-1
ii  gkbd-capplet                  3.22.0.1-1
ii  gnome-online-accounts         3.22.0-1
ii  gnome-user-guide              3.22.0-1
ii  gnome-user-share              3.18.3-1
ii  iso-codes                     3.70-1
ii  libnss-myhostname             231-4
ii  mousetweaks                   3.12.0-1
ii  network-manager-gnome         1.4.0-2
ii  policykit-1                   0.105-16
ii  pulseaudio-module-bluetooth   9.0-3
ii  realmd                        0.16.3-1
ii  rygel                         0.30.3-1
ii  system-config-printer-common  1.5.7-2

Versions of packages gnome-control-center suggests:
ii  gstreamer1.0-pulseaudio  1.8.3-1+b1
ii  libcanberra-gtk-module   0.30-3
ii  libcanberra-gtk3-module  0.30-3
ii  x11-xserver-utils        7.7+7

-- no debconf information