Distance inheritance

[rpspringuel]

Given the proliferation of circumstantial distances, it might be useful if we set up a system whereby one distance could be specified as inheriting its value from another.

Something like \greinheritdim{bar@virgula@standalone@notext}{bar@virgula@standalone@text} would indicate that the user wants bar@virgula@standalone@text to inherit the value of bar@virgula@standalone@notext so changes to the latter would effect the former.

This could also be implemented as a feature of \grechangedim but the third argument (scalable or fixed) becomes redundant in this case. Perhaps it would be better if that argument was made optional if we decide to go that route.

[henryso]

How about \grechangedim{bar@virgula@standalone@notext}{bar@virgula@standalone@text}{inherited} ?

[rpspringuel]

Hadn't thought of that. The only potential problem I can see is what do we do if a user enters something like: \grechangedim{bar@virgula@standalone@notext}{bar@virgula@standalone@text}{scalable}? Would raising an error be enough?

[henryso]

I think raising an error would be enough in that case. Same with \grechangedim{bar@virgula@standalone@notext}{1 cm}{inherited}; should be an error.

[eroux]

I thought about an inheritance system based on the name (foo@bar would automatically inherit from foo if it exists), but that's just too complex. @henryso 's proposal looks good to me