[kupfer] (38 commits) ...Merge the "comma trick" work

[Ulrik Sverdrup <usverdrup src gnome org>]

Summary of changes:

  cbb76aa... commatrick: Introduce object stack in the view and learn ho
  54ba4f4... commatrick: Introduce an object stack per Pane in the data 
  5905095... commatrick: Define action logic inside commandexec
  17d0f80... commatrick: Selection is not directly the objects used for 
  455097e... commatrick: Actions for multiple leaves
  62f24b4... commatrick: Multiple action dispatch
  923407f... commatrick: Allow composing multiple objects
  90166dc... commatrick: Check valid iobjects in commandexec
  31625fa... commatrick: Take first object's object_source
  20c6438... commatrick: Adjust OpenWith for activate_multiple
  c91e61a... commatrick: Adjust Search Contents action for activate_mult
  2e6a114... fileactions: Allow creating archives from a collection of f
  36aacb2... commatrick: Resolve actions by commandexec in puid (persist
  219a709... commatrick: Make MultipleLeaf serilizable
  a5ca20f... commatrick: Clear stack on Ctrl+R (reset all)
  1cff8b7... commatrick: Allow going up with "back/left" arrow even with
  2bbe473... commatrick: Consistent object stack API across panes
  45f1853... commatrick: Fix bug in commandexec for multiple action acti
  1d35154... commatrick: Enable the "comma trick" even for the third pan
  f727f20... commatrick: Don't allow pushing duplicates to object stack
  1171ddd... applications: Adjust "Open With..." action for multiple dis
  f993a7e... commatrick: Run (Take Result) takes all content as a Multip
  d55b3e1... Add a relatively simple general icon for multiple objects
  0651e0b... Make kupfer-object-multiple the default fallback for Source
  11481ed... commatrick: Use kupfer-object-multiple icon for MultipleLea
  bdb4214... Draft NEWS
  78777ad... rhythmbox: Adapt "Play" action to multiple dispatch
  3ae6d7d... commatrick: Mark MultipleLeaf as serializable (not experime
  953f2f6... Split out part of commandexec into actioncompat
  4d8f985... commatrick: Clear object stack before a result object is se
  b04bd74... google_translate: Define repr_key for query source
  1459083... commatrick: Combine the result of multiple actions
  68816ee... commatrick: Adjust defaultmail for multiple dispatch
  389d8ef... Encode commandline in locale encoding in utils.spawn_async
  3001f55... commatrick: Adjust Claws Mail actions for multiple dispatch
  0da1f7e... commandexec: Long ridiculous explanation (disclaimer)
  9466ae4... higherorder: no need to mention kupfer in description
  2c50aa2... Merge the "comma trick" work