MathTex.copyFrom constructor
      
      MathTex.copyFrom(
    
    
- MathTex mob
Implementation
MathTex.copyFrom(MathTex mob)
    : argSeparator = mob.argSeparator,
      subStringToIsolate = [...mob.subStringToIsolate],
      texStrings = [...mob.texStrings],
      texToColorMap = mob.texToColorMap,
      super.copyFrom(mob);