Set Text Size is empty but then not empty

[Sivakatirswami]

I have a small stack I am deploying for translation of Tamil and  
transliteration.

It has a number of text fields and I would like the user to be able  
to change the text size of all the fields, depending on their screen  
resolution they will need to either increase or reduce the fonts size  
to work.

Problem: Many of these fields are pre-filled with text.

I use this script to attempt to change the font sizes:

A menu button simply passes an integer between 10 and 24 to "tSize"

on setFontSize tSize
   put "tamil,exact,edited,flat" into tFlds
   repeat for each item da in tFlds
     set the textsize of fld da to empty
     set the textsize of fld da to tSize
     set the textsize of fld (da&"_Title") to tSize
      set the textsize of fld (da&"_Line") to tSize
   end repeat
end setFontSize

but the font sizes are not changing. The Textheight *does* change and  
reflects the new size issued from the menupick but the text in the  
field does not change...

Now... if I select the text of the fld and use this from another button:

on mouseUp
     set the textsize of the selectedtext to  empty
end mouseUp

The text in the field suddenly takes the size value I just set from  
the previous attempt. i.e. it immediately inherits the textsize just  
previously set for the field... but now, If I try to use the textsize  
to change the font again, nothing happens, the text in the fields  
retain the font size that it just inherited a few moments ago.

I infer from this and the docs that the textsize of fld and the  
textsize of a textChunk in a field are two different "objects"   But  
is seems unintuitive to me that, once a text chunk (in this case the  
selection: the entire text of the field)  has it's textsize set to  
"empty" that it should then suddenly take on the inherited text size  
as its "own" property...

is this a bug? I think the work around would be: set the text of the  
fld And the text in it at the same time.

Anyway have any thoughts or insights?

Sivakatirswami