Add exception for encapsulated short class lookup (modelica#2759)

* Add exception for encapsulated short class lookup, and example demonstrating it.
Closes modelica#2743

chapters/classes.tex

@@ -600,6 +600,8 @@ \subsection{Short Class Definitions}\label{short-class-definitions}
 end IDENT1;
 \end{lstlisting}
 
+An exception to the above is that if the short class definition is declared as \lstinline!encapsulated!, then the modifiers follow the rules for encapsulated classes and cannot be looked up in the enclosing scope.
+
 \begin{example}
 Demonstrating the difference in scopes:
 \begin{lstlisting}[language=modelica]
@@ -616,6 +618,8 @@ \subsection{Short Class Definitions}\label{short-class-definitions}
     // Gives the singular equation R=R, since the right-hand side R
     // is searched for in LoadError and found in its base-class Resistor.
   end LoadError constrainedby TwoPin;
+  encapsulated model Load2=.Resistor(R=2); // Ok
+  encapsulated model LoadR=.Resistor(R=R); // Illegal
   Load a,b,c;
   ConstantSource ...;
   ...