[tracker] (29 commits) Created branch wip/carlosg/portal

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/portal' was created.

Summary of new commits:

  93bcecf... libtracker-data: Add support for graph/service control over
  3790166... libtracker-data: Add support for CONSTRAINT query prologues
  3344f72... libtracker-data: Allow reducing set to the empty graph
  b551a3f... libtracker-data: Remove dead code
  83c1cf3... libtracker-data: Refactor find_graph() function
  d26b062... libtracker-data: Filter find_graph() by the given constrain
  2576a68... libtracker-data: Restrict all uses of tracker_triples to th
  1c2f858... libtracker-common: Add method to build dbus URI
  6d5207c... libtracker-data: Implement DEFAULT/ALL in CONSTRAINT declar
  b1dfd00... libtracker-data: Filter down updates on forbidden graphs
  5cc1090... libtracker-data: Check graph permissions on graph manipulat
  b2ab16f... libtracker-data: Add graph policy checks on FTS queries
  1c6a5b0... libtracker-sparql: Export DBus endpoint structs in private 
  45752c8... libtracker-sparql: Add private filtering methods to Tracker
  e4bcc81... portal: Add XDG portal implementation
  b745b40... portal: Implement filtering endpoint
  7a194b5... libtracker-bus: Fallback through portal on bus connections
  988bcec... examples: Add example flatpak definition
  6a49bce... portal: Handle */default keywords in policy
  33a1fa3... portal: Set up watch on peers
  e4a9295... portal: Add DBus service file
  aa874b0... docs: Add xdg-tracker-portal manpage
  b33a2e3... portal: Add CloseSession request
  cf4203b... libtracker-bus: Explicitly close sandbox sessions on connec
  b77d642... libtracker-data: Cache connections in SERVICES{} virtual ta
  1fb1999... portal: Add systemd user session unit file
  d7162d5... portal: Handle missing .flatpak-info file
  efa9aa2... tests: Add tests for CONSTRAINT declarations in prologue
  3639552... portal: Handle default object path in lookups