Specify that preserveAspectRatio is a hint, so that we don't have to …

…perform special actions when components don't follow it.

Closes modelica#2268

chapters/annotations.tex

@@ -358,10 +358,11 @@ \subsubsection{Coordinate Systems}\doublelabel{coordinate-systems}
 the first point shall be less than the coordinates of the second point
 {[}\emph{a first quadrant coordinate system}{]}.
 
-The attribute \lstinline!preserveAspectRatio! specifies a constraint on the shape of
-components of the class. If \lstinline!preserveAspectRatio! is true, changing the
-extent of components shall preserve the aspect ratio of the coordinate
-system of the class.
+The attribute \lstinline!preserveAspectRatio! specifies a hint for the shape of
+components of the class, but does not actually influence the rendering of the component. 
+If \lstinline!preserveAspectRatio! is true, changing the
+extent of components should preserve the current aspect ratio of the coordinate
+system of the class.  
 
 The attribute \lstinline!initialScale! specifies the default component size as
 \lstinline!initialScale! times the size of the coordinate system of the class. An