Deduplicate diagnostics across linkedProjects #13858
Description
In some cases, for compilation-related reasons (different target triples or compilation flags), it may be desirable to keep some parts of a single developer workspace/project not part of a single Cargo workspace (so that they do not share a target directory, or do not participate in workspace-wide build commands). If this is done, the option rust-analyzer.linkedProjects can be used to tell rust-analyzer about all of the Cargo workspaces within the project.
Currently, if a crate in one such workspace has a path dependency on a crate in another such workspace, the result will be that any warnings occurring in the latter are duplicated.
Feature request: Deduplicate warnings which are identical except for arising from distinct linkedProjects.