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

[Gerion Entrup <gerion.entrup@flump.de>]

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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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