Document subprocess coverage measurement - #99
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Covers the new coverage_subprocesses property, how the startup hook and the configuration hand-off make a spawned Python measure itself, what happens instead under --no-venvs, and the coverage.py 7.13 floor that comes with it. Accompanies pybuilder/pybuilder#949.
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Documents the subprocess coverage measurement added in pybuilder/pybuilder#949.
v0.13.x.md) — new 0.13.22 section: subprocess measurement and thecoverage_subprocessesproperty under New Features, the coverage.py>=7.13floor under Changed Features.plugins.md) —coverage_subprocessesrow in the coverage property table, plus a "Measuring subprocesses" subsection explaining the startup hook, the recursion into nested builds, and what happens under--no-venvs.manual.md) — a "Subprocess Measurement" section in the coverage chapter and a bullet in the coverage mechanics list.The
--no-venvscase is called out separately in both the manual and the plugin reference, because nothing of PyBuilder's is planted into a Python it did not build: measurement there rides on coverage.py's own startup hook, which is the reason for the 7.13 floor.