[empathy] (18 commits) ...Merge branch 'move-video-preview-656268'

[Emilio Pozuelo Monfort <epm src gnome org>]

Summary of changes:

  c5426c1... empathy-call: call gdk_disable_multidevice()
  e5658d6... CallWindow: add top and right margin to the preview contain
  6526ece... CallWindow: allow to move the video preview
  9fba3ff... CallWindow: show drop zones when dragging the preview
  c3b3b11... Factor out empathy_call_window_get_preview_position()
  47f4a65... CallWindow: highlight drop zones when hovered
  2848d12... Move empathy_call_window_get_preview_position around
  30d64de... Factor out empathy_call_window_get_preview_rectangle
  c0a10ef... Factor out empathy_call_window_darken_preview_rectangle
  ca2cb73... Highlight the preview when hovered
  724eac5... Don't darken the preview when dragging it
  4966277... Darken the rectangles when starting a drag operation
  f0eb3e3... Use self->priv->preview_pos to determine the preview positi
  5e685d0... empathy-call: add COGL and Clutter option groups
  253837e... CallWindow: create the rectangles after the avatar
  f682f50... CallWindow: add extra bottom margin for the floating toolba
  aeb15b7... Don't define the same thing twice
  80c90eb... Merge branch 'move-video-preview-656268'