[balsa] (6 commits) Non-fast-forward update to branch popover

[Peter Bloomfield <peterb src gnome org>]

The branch 'popover' 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:

  60e57e3... pref-manager: Use GtkPopover for "Add" options
  03ff458... vfs: Port to GMenu
  92f3416... libbalsa-vfs: New API to use with GMenu

Commits added to the branch:

  450b7c7... mailbox: Do not sort until messages are threaded (*)
  f5a2679... mailbox: Remove another idle handler when closing (*)
  ad3f57b... [Patch] ical improvements (*)
  7938052... pref-manager: Use GtkPopover for "Add" options
  aaae31f... vfs: Port to GMenu
  9c7adbc... libbalsa-vfs: New API to use with GMenu

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