As I work with text in C++ mode the indentation begins to deteriorate. For
example, TAB on the class line wrongly indents it:

 

    template<class _Enum>

      class Build<TL::End,_Enum>

 

I work-around the problem by writing the buffer, killing the buffer, then
visiting the file and re-indenting with TAB on the class line to get the
expected indentation:

 

    template<class _Enum>

    class Build<TL::End,_Enum>

 

Same thing happens with ESC C-q.

 

My impression is there is internal state which doesn't get cleared as I work
the text toward a syntax correct unit, causing incorrect indentation.  The
bad state is ultimately cleared by re-visiting the file. 

 

Sorry I can't come up with something reproducible.  

 

Has anyone else seen this issue?