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This adds a neat feature to display a coverage gutter in the current document, similar to the look of the diff gutter. It works by reading cobertura coverage information from a file set by the
HELIX_COVERAGE_FILE
environment variable, checking if the current document was contained in the coverage file and checking that the coverage file was modified more recently than the document. The coverage is only displayed if all these checks pass.A screenshot showing some valid coverage, generated with
RUSTFLAGS="-C instrument-coverage",
LLVM, andlcov_cobertura
:If there is any interest in merging this, here are a few things that could be improved: