Deleting a char inside a textField via code

[Richmond Mathewson]

Thanks

On 31/8/2018 9:30 pm, Paul Dupuis via use-livecode wrote:
> If you want to delete the last characters by script, why not something like:
>
> delete last char of fld X

This works, of course, if it is the last char in the field.
>
> Or a more complex version might be
>
> put the selectedChunk into tWhere
> put word 2 of tWhere into tStart -- staring char position of the cursor
> put word 4 of tWhere into tEnd -- ending char position of the cursor
> if tStart > tEnd then -- just an insertion point
>    delete char tEnd of field X -- delete the character just before the
> insertion point
> else -- some field content is selected, so
>    delete char tStart to tEnd of fld X -- delete the selected field content
> end if

While this sort of thing works it mucks up the font settings of the 
field (and I'm using fields with multiple font settings).
>
> I did this from memory, so check the dictionary for the exact
> expressions returned by the selectedChunk function.,

Richmond.
>
> On 8/31/2018 1:57 PM, Richmond Mathewson via use-livecode wrote:
>> Digging further . . .
>>
>> I found out that the problem appearas:
>>
>> 1. NOT to be with LiveCode.
>>
>> 2. NOT to be with MacOS.
>>
>> Because using a font other than my one works well.
>>
>> So?
>>
>> What hidden aspects of my Devawriter.ttf font are gumming up the works?
>>
>> Richmond.
>>
>> On 31/8/2018 6:44 pm, Richmond Mathewson wrote:
>>> Normally, if one were typing into a textField and made a mistake one
>>> would hit the back delete key
>>> and the mistake would vanish.
>>>
>>> How does one do this "programmatically"?
>>>
>>> Here's the (admittedly odd scenario):
>>>
>>> Unicode behaves inconsistently in various marginal cases with
>>> Devanagari script,
>>> and what happens is that the first time one sends this:
>>>
>>> put numToCodePoint(7418) after the selectedText
>>>
>>> one ends up with a useless square.
>>>
>>> But if one does this:
>>>
>>> put numToCodePoint(7418) after the selectedText
>>> put numToCodePoint(7418) after the selectedText
>>>
>>> one ends up with the useless square PRECEDED by the target glyph.
>>>
>>> So, the 'clever' work around might be to do this:
>>>
>>> put numToCodePoint(7418) after the selectedText
>>> put numToCodePoint(7418) after the selectedText
>>>
>>> followed by deleting the useless square
>>>
>>> However doing this:
>>>
>>> put numToCodePoint(65288) after the selectedText
>>>
>>> results in another useless square.
>>>
>>> Richmond.
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