Delete EWMH properties if no private->state flags are set. (#66754)

Delete EWMH properties if no private->state flags are set. (#66754)

	* gdk/x11/gdkwindow-x11.c (set_initial_hints): Delete EWMH
	properties if no private->state flags are set.  (#66754)

	* gtk/gtkwidget.c (gtk_widget_class_find_style_property):
	* gtk/gtkcontainer.c (gtk_container_class_find_child_property):
	Doc typo fixes.

	* gtk/tmpl/gtktextview.sgml: Add docs.

	* gtk/tree_widget.sgml: Fix some links.

	* gtk/tmpl/gtkwindow.sgml: Add docs.

	* gtk/tmpl/gtkeditable.sgml: Document GtkEditable as an interface,
	not as an abstract base class.

	* gtk/gtk-docs.sgml: Move GtkEditable from "Abstract Base Classes"
	to "Numeric/Text Data Entry".