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Bug 612931 - Moving individual layer in layer group not possible with Move Tool in 'pick a layer' mode

When using GimpPickable::get_opacity_at(), don't consider group layers
as having content.

Resurrect the help string "You can drop dockable dialogs here" inside
GimpPanedBox. It got killed when we removed GimpDockSeparator.

Make gimp_image_get_uri() and gimp_image_get_filename() behave as in
the GIMP 2.6 days. Add new functions gimp_image_get_xcf_uri(),
gimp_image_get_exported_uri() and gimp_image_get_imported_uri().

There is no reason to not do that, especially since we soon will make
color space information in the BMP file optional.

Refactor GimpImageWindow session management. As far as session
management goes, there are four states and four transitions that are
interesting.

The states are:

 State    Window mode     Images opened
 ------------------------------------------
  s1          swm               0
  s2          swm              >0
  s3          mwm               0
  s4          mwm              >0

The transitions are:

  Transition     Description
 -------------------------------------------
      t1         Enter single-window mode (swm)
      t2         Enter multi-window mwm (mwm)
      t3         Open an image
      t4         Close an image

When thinking of it like this, it is pretty easy to see when to call
gimp_image_window_session_clear() and when to call
gimp_image_window_session_apply(). So kill
gimp_image_window_set_entry_id() and handle all transitions in
gimp_image_window_session_update().

This reverts commit c19560b0.
It was already included, don't know how I could miss that.

Make GimpToolbox and GimpToolPalette use the GimpUIManager and
GimpDialogFactory of the top container instead of holding references
on their own. If they hold references on their own, we need to update
these when we move e.g. GimpToolbox between different top level
containers such as GimpDockWindow and GimpImageWindow. Failure to do
this cased problems talked about in bug 646794 (case 2).

It's just weird not to.

When switching on single-window mode, put docks in the image window
depending on what side of the window they originally had.

When moving out GimpDock:s from a GimpDockColumns into a new
GimpDockWindow when switching off single-window mode, try to preserve
the size of the original GimpDockColumns.

It's enough to setup gimp_toolbox_drop_uri_list() on the vbox.