[NTG-context] Changed behavior of ^^ in csname

[Hans Hagen]

On 6/11/2020 4:06 AM, Marcel Fabian Krüger wrote:
> Hi,
> 
> I noticed that in the latest LMTX version, ^^ (with ^ of catcode 7)
> is no longer interpreted inside csnames. Is this intentional?
> 
> (Example:
> 
> \starttext
> \catcode\circumflexasciicode=\superscriptcatcode% Ensure correct catcodes
> 
> \show ^^41 % This still works and shows "> the letter A"
> 
> \show^^41 % This used to be an error "Undefined control sequence \showA",
>            % now show "> The letter A"
> 
> \show\^^41 % Used to show "> \A=undefined", now shows "> \^=macro:->\enco_handle_accent {^}"
>             % and "! Missing $ inserted"
> \stoptext
> 
> )
Indeed that is intentional because in lmtx we disable them (partially). 
You have to say:

\normalsupmarkmode\zerocount % we use 1 as default in lmtx

This is because in lmtx we have native prescript support, as in:

   $ x^{rt}_{rb}^^{lt}__{lb} $

so, double _ ^ can have a different meaning there.

Hans


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