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patch: round-trip the function context in hunk headers #306

Job	Run time
lint	43s
check-features	10s
test (nightly)	26s
replay (llvm/llvm-project) / unidiff	1m 38s
test (beta)	21s
test (1.85.0)	26s
replay (diffy) / gitdiff	14s
test (stable)	19s
no-std	17s
semver	15s
replay (llvm/llvm-project) / gitdiff	1m 35s
replay (git/git) / gitdiff	1m 15s
replay (rust-lang/rust) / unidiff	1m 31s
replay (git/git) / unidiff	1m 18s
replay (golang/go) / gitdiff	38s
replay (torvalds/linux) / gitdiff	1m 28s
replay (diffy) / unidiff	24s
replay (torvalds/linux) / unidiff	1m 27s
replay (rust-lang/rust) / gitdiff	1m 6s
replay (golang/go) / unidiff	42s
	16m 13s