6ad1a07116
3710: Inlay hints for method chaining pattern r=matklad a=M-J-Hooper This PR adds inlay hints on method call chains:  It is not only explicit `MethodCall`s where this can be helpful. The heuristic used here is that whenever any expression is followed by a new line and then a dot, it resembles a call chain and type information can be #useful. Changes: - A new `InlayKind` for chaining. - New option for disabling this type of hints. - Tree traversal rules for identifying the chaining hints. - VSCode decorators in the extension layer (and associated types). Notes: - IntelliJ has additional rules and configuration on this topic. Eg. minimum length of chain to start displaying hints and only displaying distinct types in the chain. - I am checking for chaining on every `ast::Expr` in the tree; Are there performance concerns there? This is my first contribution (to RA and to Rust in general) so would appreciate any feedback. The only issue I can find the references this feature is #2741. Co-authored-by: Matt Hooper <matthewjhooper94@gmail.com>
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