[gnome-shell] (13 commits) Non-fast-forward update to branch wip/laney/systemd-user

[Iain Lane <iainl src gnome org>]

The branch 'wip/laney/systemd-user' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  7802644... endSessionDialog, loginManager: Get the session ID from log
  02294b0... Add systemd units

Commits added to the branch:

  8237a1f... Change "const" to "var" (*)
  a24999b... st-texture-cache: Don't add NULL textures to cache (*)
  1f03599... st-texture-cache: Save cairo surfaces to a different map (*)
  5fe349d... thunderbolt: Do not auto start boltd (*)
  c9bf72c... windowMenu: Check if monitorIndex is valid before using it (*)
  19e864e... keyboard: Handle case where keyboardMonitor is unset (*)
  84d2d3f... keyboard: Check monitor validity before deferencing it (*)
  8789469... windowManager: Don't animate unmanaged windows on (un)minim (*)
  996dd74... layoutManager: Return null monitor if focusIndex is invalid (*)
  2ba2640... st-icon: Remove unused size values (*)
  e522e2e... st-icon: Create shadow pipeline only at paint (*)
  e39d715... st-private: Warn if creating shadow for unallocated actors (*)
  2316ed7... endSessionDialog, loginManager: Get the session ID from log

(*) This commit already existed in another branch; no separate mail sent