addquotes and infixes

[LeonPyramid]

When a word is already quoted but an infix of it is also a knowledge word, addquotes asks if you want to add quotes arround the infix:

\knowledge{standard}
 | viable
 | $\Nn $-viable

gives the output:

l60: $ \lin_\Nn(M) $ is "$\Nn$-viable".
Add quotes? [y/n]

[LeonPyramid]

Problem found : was caused by the spaces in the knowledge (were automatically added by cluster).

[remimorvan]

Actually that a very good point!
The spaces are not added by knowledge-clustering but by knowledge (the space is present in the .diagnose files), and from what I understand, for LaTeX / knowledge, there is no sensible difference between $\Nn $ and $\Nn$, so there is no reason for knowledge-clustering to treat them differently.
Moreover, it shouldn't propose to add quotes around a substring surrounded by quotes!