André Pönitz ef9cb74104 selection using the mouse should work now. Note: an x is not a y, nor is
a y an x. Even if x's and y's come in disguise as xo's or yo's. Then, an xo
is not a yo nor is a yo a x0.  Aaaargh...


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@3047 a592a061-630c-0410-9148-cb99ea01b6c8
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Inset 'Xyz' is implemented by 'MathXyzInset' in 'math_xyzinset.[hC]'


Inset hierarchy:
                                   
                                   MathInset   
                                (abstract base)

                         /            |             \

              Dim                  Char                   MacroArg
         (thing that need       (for things formerly 
          the width_/ascent_     known as characters) 
          /descent_ cache)
        
          /             \

       Nest              Dots  Func  Space  Symbol Bigop Noglyph
  (for thing with      
   nested content)     

        |         \

      Grid        Decoration   Delim   Frac  Macro  Root  Script  Sqrt

      /   \

 Array     "Matrix"
         (base for eqnarray/align/...)



There are only two "real LyXInsets" in here:

Formula       - containing a pointer to a  MathMatrixInset (a misnomer...)
FormulaMacro  - containing a pointer to a  MathMacroTemplate