* If the `symmetric' class option is provided, then we set the chapter

headings atop only the main textblock, not across the
  textblock+sidenotes.


git-svn-id: https://tufte-latex.googlecode.com/svn/trunk@64 516e2f36-ce3a-0410-bea4-1d4a03f5df72

tufte-common.sty

@@ -769,11 +769,11 @@
 
 \titleformat{\chapter}%
 	[display]% shape
-        {\relax\begin{fullwidth}}% format applied to label+text
+        {\relax\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\begin{fullwidth}}{}}% format applied to label+text
         {\itshape\fontsize{22}{24}\selectfont\thechapter}% label
         {0pt}% horizontal separation between label and title body
         {\fontsize{22}{24}\rm\itshape}% before the title body
-        [\end{fullwidth}]% after the title body
+        [\ifthenelse{\NOT\boolean{@tufte@symmetric}}{\end{fullwidth}}{}]% after the title body