2006-01-05  Paolo Maggi  <paolo@gnome.org>

	Implemented search highligthing: all the occurences of the searched
	text are highlighted

	* data/gedit.schemas.in: added editor/search_highlighting/enable key

	* gedit/Makefile.am: compile gtktextregion.[ch]

	* gedit/gtktextregion.[c]: new files

	* gedit/gedit-document.c (gedit_document_finalize): destroy
	to_search_region if needed
	(gedit_document_get_property): get the enable-search-highlighting
	property
	(gedit_document_set_property): new function
	(gedit_document_class_init): added enable-search-highlighting property
	and search_highlight_updated signal
	(gedit_document_init): initialize enable-search-highlighting property
	and connect "insert-text" and "delete-rande" signals
	(compute_num_of_lines): new function
	(gedit_document_set_search_text): update search hl if needed
	(gedit_document_get_can_search_again): fixed to manage the case
	in which search_text is empty
	(search_region): new funtion
	(to_search_region_range): ditto
	(_gedit_document_search_region): ditto
	(insert_text_cb): ditto
	(delete_range_cb): ditto
	(gedit_document_set_enable_search_highlighting): ditto
	(gedit_document_get_enable_search_highlighting): ditto

	* gedit/gedit-document.h: added search_highlight_updated signal and
	declare gedit_document_[set|get]_enable_search_highlighting and
	_gedit_document_search_region functions

	* gedit/gedit-prefs-manager-app.c (gedit_prefs_manager_app_init)
	(gedit_prefs_manager_syntax_hl_enable_changed)
	(gedit_prefs_manager_search_hl_enable_changed): added support for
	editor/search_highlighting/enable key

	* gedit/gedit-prefs-manager.[ch]: added support for
	editor/search_highlighting/enable key

	* gedit/gedit-view.c (gedit_view_class_init): set expose_event default
	handler
	(gedit_view_new): connect to "search_highlight_updated" signal
	(gedit_view_expose)(search_highlight_updated_cb): new functions