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Actually gtk+ should provide a gtk_tool_item_group_new_with_label_widget() method but
it doesn't and using the construct properties seems broken.

Add an implementation of the GtkTreeModel interface to GladeProject

We already depends on GTK+ 2.20

Added src/glade-close-button.c and removed
plugins/gtk+/glade-cell-renderer-button.c

	  - Stop showing preferences at project new time (now we have tooltips that tell you this stuff),
	    finally closing bug 574095.

	* gladeui/glade-project.c: Display GTK+ in caps and always assume GTK+ as a project dependency
	  (so that empty projects still depend on GTK+ for display purposes).

	  - Added option to show/hide statusbar in the View menu and session data.

	  in the signal editor when doing so.

	* src/Makefile.am, src/glade-close-button.[ch]: Using Paolo Borelli's close button code for notebook
	  tab close buttons.

	* src/glade-window.c:
	  - Added option to disable toolbar in View menu and session data (bug 586194).
	  - Added option to show notebook tabs for open projects also in the View menu and session data.

	* gladeui/glade-palette.c: Made "both" mode use text horizontally again, still get alot of unwanted
	  ellipsize here.

	* gladeui/glade-project.c: Added the targets-changed signal to refresh views with data about
	  target project versions (notebook tabs).

	  asks for an icon at startup.

	* gladeui/glade-signal-editor.c: Fixed access to signal name in object dialog hander (was a crasher).

	* gladeui/glade-widget.c: Fixed GladeWidget to update support warnings on newly added signals.

	* plugins/gtk+/glade-gtk.c, plugins/gtk+/gtk+.xml.in: Block the glade_gtk_text_buffer_changed()
	  handler when updating the buffer text (this feedback loop was causing segfaults when undoing
	  modifications to a text buffer's text).

	* gladeui/glade-popup.c: Allow adding new actions to action groups from the palette ("Add widget here").

	* plugins/gtk+/glade-accels.[ch]: Moved individual accelerator [de]serialization here, special integration
	  for action types, for actions only show one accelerator and dont load/save the "activate" signal name.

	* plugins/gtk+/glade-gtk.c, plugins/gtk+/gtk+.xml.in: Added support for GtkActionGroup <--> GtkAction
	  relationships and support for editing/loading/saving of accelerators which can be associated with
	  actions inside an action group.

	  - Reordered support icon to come before the signal name and let the column be user
	    resizable along with the others (non-resizable unellipzised signal name columns expand over time)

	  - Fixed an assertion and page-size != 0 for adjustment properties in libglade mode

	* gladeui/glade-signal-editor.c:
	  - Dont show swapped column in libglade mode

	  - Give object dialogs a bigger default size and hide the column headers

	* gladeui/glade-signal-editor.c:
	  - Now show an icon and tooltip in rows for signals that are only
	    supported in the future, refresh them when support changes.

	* gladeui/glade-widget-adaptor.h, gladeui/glade-property-class.h: Added some version checking macros.

	* gladeui/glade-signal.[ch]: Add support warning meta data to signals

	* gladeui/glade-project.c:
	  - Simplify code with new version checking macros
	  - Do the verify on signals for widgets as well as project warnings
	    (update the signals a verify time).

	* gladeui/glade-widget.c: GladeWidget takes a new "support-changed" to broadcast support changes
	  on the widget.

	* gladeui/glade-signal-editor.c:

	* gladeui/glade-editor-property.[ch]: Added glade_editor_property_show_object_dialog()

	* gladeui/glade-signal-editor.c:
	  - Use glade_editor_property_show_object_dialog() to select project objects for signal user data.
	  - Added tooltips for the column headers

	  instead of GladeCellRendererButton which was more convoluted (included only an icon when editing).

	* plugins/gtk+/Makefile.am: Removed glade-cell-renderer-button.[ch]

	* gladeui/Makefile.am, gladeui/glade-cell-renderer-icon.[ch]: Added activatable pixbuf renderer

	* gladeui/glade-signal-editor.c: Use new activatable pixbuf renderer to render a devhelp icon
	  and fire signal contextual devhelp searches.

	* gladeui/glade-base-editor.c: Avoid GtkEntry feedback loop with g_signal_handlers_block_by_func(),
	fixes bug 609612.

	* gladeui/glade-signal.c: Added "swapped" attribute and read/write from xml, swapped attribute is
	always saved, if its missing on load and user_data (object) is set, we assume a swapped default.

	* gladeui/glade-signal-editor.c: Allow toggling "swapped" flag of a signal if user data is set.

	* gladeui/glade-widget.c: Account for new signal "swapped" flag when modifying local signals.

	  introspected by checking if (widget_class->set_scroll_adjustments_signal) != 0.

	* gladeui/glade-utils.[ch]: Added glade_util_check_and_warn_scrollable() to check and warn the
	  user if they are trying to add a non-scrollable widget to a scrolled window.

	* gladeui/glade-app.c, gladeui/glade-popup.c, gladeui/glade-placeholder.c, plugins/gtk+/glade-gtk.c:
	Consult glade_util_check_and_warn_scrollable() before executing commands that introduce objects
	to the project.

	* plugins/gtk+/glade-gtk.c, plugins/gtk+/gtk+.xml.in:
	  - Sync attributes when they are set to be used directly and not by the model (fixes loaded state
	    of explicitly set cell renderer properties).
	  - Fix last patch to reset cellrenderer attributes from a GladeProperty::value-changed signal
	    instead of the property mutator implementation (as the "columns" property is construct-only
	    and the widget is rebuilt - property reference lists are unavailable at ->set_property time).