[NTG-context] Re: Strange extra space when using cases in an inner align in math

[Mikael Sundqvist <mickep@gmail.com>]

Hi,

There is indeed a space added in this case. But you do not need n=3.
And in fact, you do not need a simplealign either, but can use an
ordinary align, with location=packed. It looks like you had the wrong
number of \NC. I hope the examples below help, the last one is merely
for Hans for looking into why the relation-digit space is added there.

/Mikael

\definemathsimplealign[inneralign]

\showglyphs
\showboxes

\showmakeup[mathglue]

\startdocument

OK with \typ {n=2} instead of \typ {n=3}:

\startformula
  \startalign
    \NC a = b \NC \NR
    \NC       \NC \startinneralign[n=2,align={1:right,2:left}]
                    \NC A      \NC = B \NR
                    \NC f(x,y) \NC = \startcases
                                       \NC 1 \NC a \NR
                                       \NC 1 \NC b \NR
                                       \NC 1 \NC b \NR
                                     \stopcases
                                       \NR
                  \stopinneralign
                  \NR
  \stopalign
\stopformula

With align and location set to packed, instead of simplealign

\startformula
  \startalign
    \NC a = b \NC \NR
    \NC       \NC \startalign[n=2,location=packed,align={1:right,2:left}]
                    \NC A      \NC = B \NR
                    \NC f(x,y) \NC = \startcases
                                       \NC 1 \NC a \NR
                                       \NC 1 \NC b \NR
                                       \NC 1 \NC b \NR
                                     \stopcases
                                       \NR
                  \stopalign
                  \NR
  \stopalign
\stopformula

Extra \typ {reldig} space before the 1:

\startformula
\startalign[n=3,location=packed,align={1:right,2:middle,2:left}]
                    \NC A      \NC = \NC B \NR
                    \NC f(x,y) \NC = \NC \startcases
                                           \NC 1 \NC a \NR
                                           \NC 2 \NC b \NR
                                         \stopcases
                                           \NR
\stopalign
\stopformula

\stopdocument

On Tue, Aug 20, 2024 at 11:55 AM Gerion Entrup <gerion.entrup@flump.de> wrote:
>
> Hi,
>
> I currently have the case of a strange extra space in math mode when using cases in inner align.
>
> Here is a MWE to demonstrate the problem:
> ```
> \definemathsimplealign[inneralign]
> \startdocument
> \startformula
>         \startalign
>                 \NC a = b \NR
>                 \NC \NC \startinneralign[n=3,align={1:right,2:middle,3:left}]
>                         \NC A \NC = \NC B \NR
>                         \NC f(x,y) \NC = \NC \startcases
>                                  \NC \text{strange}  \NC a \NR
>                                  \NC \text{normal}  \NC b \NR
>                                  \NC \text{also normal}  \NC b \NR
>                         \stopcases
>                 \stopinneralign
>         \stopalign
> \stopformula
> \stopdocument
> ```
>
> "strange" and "normal" are not aligned what I would expect but strange has more space in front of it.
> Is this a usage error or a bug in the math engine?
>
> Best,
> Gerion___________________________________________________________________________________
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