Fix alias renaming usage

[Bben01]

Close #13498

[Bben01]

I tried to fix it the same way #9148 did, just on a lower level

[Veykril]

Heh, this is actually a fun issue. So the problem here is more that the original name is a prefix of the alias name, which makes our search do wrong things. The correct place to fix this is not in the renaming code actually, but in the search part.

We should instead check here https://github.com/rust-lang/rust-analyzer/blob/master/crates/ide-db/src/search.rs#L460-L468
if the name like we found has the same text as the name we are looking for. Due to find_nodes_at_offset_with_descend returning the macro expanded result this token may differ, so we need to do the filtering before, we can probably do this by doing what find_nodes_at_offset_with_descend manually, the relevant parts being https://github.com/rust-lang/rust-analyzer/blob/master/crates/hir/src/semantics.rs#L926-L943

This turns the fix into something more complex unfortunately, if you don't feel like doing this that's obviously fine, if you want to tackle it and have questions feel free to ask.

[Veykril]

Put up #13549 to fix it as this causes more problems than just renaming