re-add the tear avoidance patch, with an extra zoom redraw fix

libgnomecanvas.spec

@@ -8,9 +8,11 @@
 Summary: GnomeCanvas widget
 Name: libgnomecanvas
 Version: 2.20.1
-Release: 1%{?dist}
+Release: 2%{?dist}
 URL: http://www.gnome.org/
 Source0: http://download.gnome.org/sources/libgnomecanvas/2.20/%{name}-%{version}.tar.bz2
+Patch0: libgnomecanvas-2.19.2-avoid-tearing.patch
+Patch1: zoom-redraw-fix.patch
 License: LGPLv2+
 Group: System Environment/Libraries 
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n) 
@@ -47,6 +49,8 @@ Tk canvas widget but has evolved quite a bit over time.
 
 %prep
 %setup -q
+%patch0 -p1 -b .avoid-tearing
+%patch1 -p1 -b .zoom-redraw-fix
 
 %build
 export CFLAGS=$(echo $RPM_OPT_FLAGS |sed -e 's/O2/O1/g')
@@ -87,6 +91,9 @@ rm -rf %{buildroot}
 %{_datadir}/gtk-doc/html/libgnomecanvas
 
 %changelog
+* Mon Nov 12 2007 Matthias Clasen <mclasen@redhat.com> 2.20.1-2
+- Readd the scrolling patch, with an extra fix for redraw problems
+
 * Mon Oct 15 2007 Matthias Clasen <mclasen@redhat.com> 2.20.1-1
 - Update to 2.20.1 (translation updates)
 

zoom-redraw-fix.patch

@@ -0,0 +1,53 @@
+2007-11-05  Federico Mena Quintero  <federico@novell.com>
+
+	Fix these bugs:
+	http://bugzilla.gnome.org/show_bug.cgi?id=493808
+	https://bugzilla.novell.com/show_bug.cgi?id=336941
+
+	* libgnomecanvas/gnome-canvas.c (paint): Oops, use the correct
+	visible rectangle; we forgot to take the zoom_{x,y}ofs into
+	account.  Also, take those offsets into account when generating
+	the actual rectangle to be added to the GdkRegion.
+
+diff --git a/libgnomecanvas/gnome-canvas.c b/libgnomecanvas/gnome-canvas.c
+index 5e89bc2..ca9769f 100644
+--- a/libgnomecanvas/gnome-canvas.c
++++ b/libgnomecanvas/gnome-canvas.c
+@@ -3040,6 +3040,7 @@ gnome_canvas_expose (GtkWidget *widget, GdkEventExpose *event)
+ 
+ 		if (canvas->need_update || canvas->need_redraw) {
+ 			ArtUta *uta;
++
+ 			/* Update or drawing is scheduled, so just mark exposed area as dirty */
+ 			uta = art_uta_from_irect (&rect);
+ 			gnome_canvas_request_redraw_uta (canvas, uta);
+@@ -3082,8 +3083,8 @@ paint (GnomeCanvas *canvas)
+ 
+ 	/* Turn those rectangles into a GdkRegion for exposing */
+ 
+-	visible_rect.x0 = canvas->layout.hadjustment->value;
+-	visible_rect.y0 = canvas->layout.vadjustment->value;
++	visible_rect.x0 = canvas->layout.hadjustment->value - canvas->zoom_xofs;
++	visible_rect.y0 = canvas->layout.vadjustment->value - canvas->zoom_yofs;
+ 	visible_rect.x1 = visible_rect.x0 + GTK_WIDGET (canvas)->allocation.width;
+ 	visible_rect.y1 = visible_rect.y0 + GTK_WIDGET (canvas)->allocation.height;
+ 
+@@ -3096,8 +3097,8 @@ paint (GnomeCanvas *canvas)
+ 		if (!art_irect_empty (&clipped)) {
+ 			GdkRectangle gdkrect;
+ 
+-			gdkrect.x = clipped.x0;
+-			gdkrect.y = clipped.y0;
++			gdkrect.x = clipped.x0 + canvas->zoom_xofs;
++			gdkrect.y = clipped.y0 + canvas->zoom_yofs;
+ 			gdkrect.width = clipped.x1 - clipped.x0;
+ 			gdkrect.height = clipped.y1 - clipped.y0;
+ 
+@@ -3200,6 +3201,7 @@ idle_handler (gpointer data)
+ 	GDK_THREADS_ENTER ();
+ 
+ 	canvas = GNOME_CANVAS (data);
++
+ 	do_update (canvas);
+ 
+ 	/* Reset idle id */