[balsa] (11 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:

  af29c67... pref-manager: Use GtkPopover for "Add" options
  a6b3f8a... vfs: Port to GMenu
  d864f4a... libbalsa-vfs: New API to use with GMenu

Commits added to the branch:

  9c40d09... mailbox: Always use an idle callback (*)
  c0615fd... mailbox: Lock the mailbox in idle callbacks (*)
  774e32f... mailbox-local: Lock the mailbox in idle callbacks (*)
  e2bc5a2... mailbox-local: Clear idle handler id (*)
  b688364... mailbox-local: Drop a redundant auxiliary struct (*)
  7b042b0... Unify wrapped label creation (*)
  7f28ebe... mailbox: lock the mailbox from start to finish (*)
  e4e1fc3... Updated Spanish translation (*)
  c7a81da... pref-manager: Use GtkPopover for "Add" options
  be890ac... vfs: Port to GMenu
  3e1c9d9... libbalsa-vfs: New API to use with GMenu

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