Text overwriting itself in non wrapping field

[Bob Sneidar]

I have a cleanASCII function: 

Bob S

FUNCTION cleanASCII pString, pModeList, pCustomList
   /*
   pModeList is a comma delimited list that may contain the following values:
   "lowercase,uppercase,numbers,tabs,newlines,returns,spaces,symbols,custom"
   If custom is used, then a third paramaeter containing allowed characters must be supplied.
   */
   IF pModeList contains dash THEN replace dash with "\" & dash in pModeList

   IF pModeList is empty THEN
      put " 0-9a-zA-Z" into tAllowedChars
   END IF
      
   REPEAT for each item pMode in pModeList
      put word 1 of pMode into pMode
      
      SWITCH
            break
         CASE "tabs" is in pMode
            put "\t" AFTER tAllowedChars
            break
         CASE "newlines" is in pMode
            put "\n" BEFORE tAllowedChars
            break
         CASE "returns" is in pMode
            put "\r" BEFORE tAllowedChars -- currently not working
            break
         CASE "spaces" is in pMode
            put " " AFTER tAllowedChars
            break
         CASE "numbers" is in pMode
            put "0-9" AFTER tAllowedChars
            break
         CASE "lowercase" is in pMode
            put "a-z" AFTER tAllowedChars
            break
         CASE "uppercase" is in pMode
            put "A-Z" AFTER tAllowedChars
            break
         CASE "symbols" is in pMode
            put "!#$%&'()*+,./:;<=>?@\|\[\]\\_`{|}~^-" AFTER tAllowedChars
            break
         CASE pMode is "custom"
            put pCustomList AFTER tAllowedChars
            break
      END SWITCH
   END REPEAT
   
   put "[" & tAllowedChars & "]" into tMatchText
   
   REPEAT for each character  theChar in pString
      IF matchtext(theChar, tMatchText) is true THEN
         put theChar AFTER cleanString
      END IF
   END REPEAT
   
   return cleanString
END cleanASCII

> On Mar 17, 2022, at 08:58 , David V Glasgow via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Hi folks,
> 
> I have imported just under 10,000 lines of a web history into a non wrapping scrollable field.  As the subject above indicates, in one line characters appear rendered over the top of each other.  The is quite stable, so redrawing or scrolling doesn’t make it go away.
> 
> That line is pretty long, but not longer than field limits - 10693 chars
> 
> Examining it, it looks like it ought to be a number of separate lines, and it also contains weird visible and also white space that is not a simple space.  I can’t see any recognisable pattern to suggest where cr should be.
> 
> Any suggestions about what is going on and how I might fix it?
> 
> Cheers
> 
> David Glasgow
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