[gnome-documents] (9 commits) ...application: Clean up OffsetController signals

[Debarshi Ray <debarshir src gnome org>]

Summary of changes:

  91d842f... mainWindow: Use a switch statement for consistency with sim (*)
  48fbfc1... search: Add a helper to get all document SearchTypes (*)
  1ed3202... mainToolbar: Create the selection menu only once during con (*)
  a437bdc... mainToolbar: Add a stack switcher for switching between the (*)
  0679e18... embed, view: Move the no-results page into the ViewContaine (*)
  1aacbdd... embed, view: Move the error page into the ViewContainer (*)
  9ec4d90... application: Let some actions be enabled across multiple wi (*)
  4c7ffba... Rework the application accommodate multiple views (*)
  13a59cd... application: Clean up OffsetController signals (*)

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