> Henri Menke <mailto:henrimenke@gmail.com>
> 30. Januar 2018 um 21:46
> On Tue, 2018-01-30 at 21:24 +0100, Wolfgang Schuster wrote:
>>> Henri Menke 30. Januar 2018 um 21:12
>>> On Tue, 2018-01-30 at 11:58 +0100, Hans Hagen wrote:
>>>> On 1/30/2018 11:34 AM, Henri Menke wrote:
>>>>> On 01/30/2018 09:17 PM, Hans Hagen wrote:
>>>>>> On 1/30/2018 2:54 AM, Henri Menke wrote:
>>>>>>> Dear list,
>>>>>>>
>>>>>>> the title says it all.  Please add \ignorespaces in a place you deem
>>>>>>> appropriate.  MWE is below.
>>>>>> sometimes you will also add \removeuwantedspaces in the stop
>>>>> I'm confused.  Does that mean there is going to be a fix?
>>>> no, why should there be? spaces are never ignored after the last [...] 
>>>> that is checked for unless a command has an explicit \ignorespaces
>>> I'm not convinced.  Both "before" and "commands" see a \relax and therefore
>>> \ignorespaces is dropped.  I can put \removeunwantedspaces there but that
>>> deletes the space before \start.  The \framed command correctly drops the
>>> space
>>> after the options.
>>>
>>> ---
>>>
>>> \definestartstop
>>>    [spurious space a]
>>>    [before=\ignorespaces,
>>>     after=\removeunwantedspaces]
>>>
>>> \definestartstop
>>>    [spurious space b]
>>>    [before=\removeunwantedspaces,
>>>     after=\removeunwantedspaces]
>>>
>>> \starttext
>>>
>>> Hello Foo Bar World
>>>
>>> Hello \start[spurious space a] Foo Bar \stop\ World
>>> %   ^^^ neither space        ^^^ is skipped
>>>
>>> Hello \start[spurious space b] Foo Bar \stop\ World
>>> %   ^^^ skips this space     ^^^ instead of this
>>>
>>> Hello \startframed[offset=overlay] Foo Bar \stopframed\ World
>>> % That's the behaviour I'm looking for.
>>>
>>> \stoptext
>>>
>>   You assume \start[<...>] ... \stop is linked to \definestartstop but this
>> isn’t the case,
>> what the environment does is to generate a start-command with the argument
>> but this works for every environment, e.g. \start[itemize] ... \stop does the
>> same
>> as \startitemize ... \stopitemize.
>
> I'm not asking to add \ignorespaces to the definition of \start.  I'm rather
> asking, where I have to but \ignorespaces in the setup to eat the space after
> the options I pass to \start.
>
Why do use insinst on the use of \start, when you create a new 
command/environment
with \definestartstop you get additional commands for the instance where 
the space
at the begin of the environment are gobbled.

\definestartstop[Highlight][style=italic,color=red]

\starttext

Text \Highlight{Text} Text

\blank

\input ward\par

\startHighlight
\input ward
\stopHighlight

\input ward

\stoptext

To answer your question where you can add \ignorespace, there is no way 
to add it.

Wolfgang