[Groff] Re: Bug in groff-1.19.2

[Gaius Mulley]

Hi David and Werner,

I've examined the test code and observe two main problems:

  (i)   equations within .tl don't work - I suspect this could be made
        to work..
  (ii)  the division by zero is occurring because the following
        characters appear to have zero height in the html device

        parenlefttp   
        parenleftex   
        parenleftbt   
        parenrighttp  
        parenrightex  
        parenrightbt  
        bracketlefttp 
        bracketleftex 
        bracketleftbt 
        bracketrighttp
        bracketrightex
        bracketrightbt

        ie
        .nr 0dwidth 0\w\(EQ\[parenrightex]\(EQ
        .nr 0eh 0\n[rst]
        .nr 0ed 0-\n[rsb]

        gives 0eh and 0eh a value of 0 which later are summed and used
        as the divisor.  I think the correct solution is to modify eqn
        to check division by zero and skip if necessary..
        I'll have a look and experiment..

regards,
Gaius