Bug 285475 - fix cairo calculation of stroke extents on lines with caps.

gfx/cairo/README

@@ -17,3 +17,5 @@ PATCHES:
   quartz.diff - update cairo quartz/atsui backend for 0.4.0, reenable.
 
   xlib.diff - include X11/xlib.h in cairo-xlib.h - needed for Solaris.
+
+  stroke-extent.diff - fix calculation of stroke extents.

gfx/cairo/cairo/src/cairo_gstate.c

@@ -1700,6 +1700,8 @@ _cairo_gstate_stroke_extents (cairo_gstate_t *gstate,
     cairo_status_t status;
     cairo_traps_t traps;
     cairo_box_t extents;
+
+    _cairo_pen_init (&gstate->pen_regular, gstate->line_width / 2.0, gstate);
   
     _cairo_traps_init (&traps);