I made an example of the effect of this on \doifmode and \startmode. The example shows that the appearance of extra space in \doifmode follows a regular pattern. The startmode case differs in that respect because \startmode[condition-true] has the extra space but \startmode[condition-false] has not. In my view that is an unwanted anomaly. A little redefinition remedies that as can be seen in the example.
spaces.pdf
Description: spaces.pdf
On 13 okt. 2011, at 17:43, Hans van der Meer wrote:
> A little while ago I asked whether \doifmode and friends should have an
> \ignorespaces at the end. Hans Hagen answered "no" and after some reasoning
> (probably along the same lines as his) I agree with him. Thus one uses in a
> quite natural way:
> some text\doifmode{xyz}{ conditional text} following text
> doing nothing else than: some text conditional text following text.
> With regard to this it is understandable and correct that extra space is
> taken in the next construct:
> some text \doifmode{xyz}{ conditional text} following text.
>
> But it looks different to me when using the \startmode .. \stopmode pair.
> ---- some text.
> \startmode[xyz]
> some conditional text.
> \stopmode
> further text.
>
> In order to avoid here the extra space one has to code an extra %
> ---- some text.
> \startmode[xyz]%
> some conditional text.
> \stopmode
> further text.
>
> or (not preferred imho):
> ---- some text.%
> \startmode[xyz]
>
> I think this is error prone as it is al too easy to forget the %. The
> situation here differs from the \doifmode-case. I tend to believe that the
> fact that the \startmode[] .. \stopmode construct invites one to separate the
> statements with newlines (whitespace thus). Therefore I would ask if this
> plea for an \ignorespaces effect at the end of the \startmode[xyz] should be
> honored.
>
> Hans van der Meer
>
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