feat: Pop a notification prompting the user to add a Cargo.toml of unlinked file to the linkedProjects #14366
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…linked file to the linkedProjects
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Wilfred
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Currently, rust-analyzer highlights the entire region when a `cfg` is inactive (e.g. `#[cfg(windows)]` on a Linux machine). However, unlinked files only highlight the first three characters of the file. This was introduced in rust-lang#8444, but users have repeatedly found themselves with no rust-analyzer support for a file and unsure why (see e.g. rust-lang#13226 and the intentionally prominent pop-up added in PR rust-lang#14366). (Anecdotally, we see this issue bite our users regularly, particularly people new to Rust.) Instead, highlight the entire inactive file, but mark it as all as unused. This allows users to hover and run the quickfix from any line. Whilst this is marginally more prominent, it's less invasive than a pop-up, and users do want to know why they're getting no rust-analyzer support in certain files.
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fix: Highlight unlinked files consistently with inactive files Currently, rust-analyzer highlights the entire region when a `cfg` is inactive (e.g. `#[cfg(windows)]` on a Linux machine). However, unlinked files only highlight the first three characters of the file. This was introduced in #8444, but users have repeatedly found themselves with no rust-analyzer support for a file and unsure why (see e.g. #13226 and the intentionally prominent pop-up added in PR #14366). (Anecdotally, we see this issue bite our users regularly, particularly people new to Rust.) Instead, highlight the entire inactive file, but mark it as all as unused. This allows users to hover and run the quickfix from any line. Whilst this is marginally more prominent, it's less invasive than a pop-up, and users do want to know why they're getting no rust-analyzer support in certain files. Before (note the subtle grey underline is only at the beginning of the first line):  After (user can hover and fix from any line): 
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cc #13226 #9661