Tab expansion of NamedTuple fails on 1.10.0-beta2

[jaakkor2]

This worked on 1.9, does not on 1.10.0-beta2.

A = (; foo=2, bar=3), and then type A.foo + A.b<TAB>. bar does not get expanded.

[oscardssmith]

Interestingly for regular structs (e.g. complex numbers) this still works.

[oscardssmith]

Pretty sure the bisect will find #49206 but would be good to be sure.

[Liozou]

Fix is up at #51366. The symptoms are a bit misleading but this issue actually has nothing to do with NamedTuple vs regular structs, it is only due to the completion of arguments of infix operator (the + here) which has been buggy since #49294.