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So gdk/gdk.h can find gdk/gdkconfig.h, which is in $builddir
because it's generated.

Based on a patch by Garrett Regier
https://bugzilla.gnome.org/show_bug.cgi?id=617322

At the same time, introduce a gtkmainprivate.h header
and various other cleanups.

Based on a patch by Tadej Borovšak.
https://bugzilla.gnome.org/show_bug.cgi?id=617471

Based on patches by Javier Jardón.

https://bugzilla.gnome.org/show_bug.cgi?id=629955

Based on a patch by Javier Jardón.

https://bugzilla.gnome.org/show_bug.cgi?id=629955

Based on a patch by Garrett Regier.

https://bugzilla.gnome.org/show_bug.cgi?id=617327

Based on a patch by Garrett Regier.

https://bugzilla.gnome.org/show_bug.cgi?id=617315

Based on a patch by Garrett Regier.

https://bugzilla.gnome.org/show_bug.cgi?id=617312

These are no longer needed. At the same time, port gtkimcontextsimpleseqs.h
to use the new GDK_KEY_ symbols.

https://bugzilla.gnome.org/show_bug.cgi?id=553404

Proposed by Nikos Kouremenos

https://bugzilla.gnome.org/show_bug.cgi?id=321958

Proposed by Bruno Piguet.

https://bugzilla.gnome.org/show_bug.cgi?id=559503

https://bugzilla.gnome.org/show_bug.cgi?id=622125

https://bugzilla.gnome.org/show_bug.cgi?id=562182

Closes https://bugzilla.gnome.org/show_bug.cgi?id=165987

Now, these states are depending on the widget class.

At the same time, add a private pointer, and generally clean
things up.

This breakage was also the cause of not correctly positioning the child
menu over the selected item.

  - Removed GtkTreeMenu from gtk-docs.sgml
  - Removed GtkTreeMenu from gtk3-sections.txt
  - Removed GtkTreeMenu from gtk.symbols
  - Make GtkTreeMenu apis prefixed with '_' (including _get_type()).
  - Updated GtkComboBox sources to use the private apis
  - Updated GtkCellView to not mention #GtkTreeMenu in gtk-doc statements
  - Updated tests/testtreemenu to not use a GtkTreeMenu but still
    show a very fancy GtkComboBox
  - Moved gtktreemenu.h to private headers section in the makefile.
  - Removed include of gtktreemenu.h from gtk.h

Now sensitivity is properly handled in the "apply-attributes" callback.

And updated gtk_combo_box_list_position() which is still waiting
for GtkTreeView to report natural width in order to properly do
non fixed width dropdown menus.

Turns out reordering the file the way I did before put
me in an unmergable situation, now re-refactored the
combo and list-mode works again.

Fixing GtkComboBox breakage after merge, completing hand-merge of style-context GtkBorder issues (now it works again).