Broken &&-chains in the test scripts have been corrected. * es/test-chain-lint: t6000-t9999: detect and signal failure within loop t5000-t5999: detect and signal failure within loop t4000-t4999: detect and signal failure within loop t0000-t3999: detect and signal failure within loop tests: simplify by dropping unnecessary `for` loops tests: apply modern idiom for exiting loop upon failure tests: apply modern idiom for signaling test failure tests: fix broken &&-chains in `{...}` groups tests: fix broken &&-chains in `$(...)` command substitutions tests: fix broken &&-chains in compound statements tests: use test_write_lines() to generate line-oriented output tests: simplify construction of large blocks of text t9107: use shell parameter expansion to avoid breaking &&-chain t6300: make `%(raw:size) --shell` test more robust t5516: drop unnecessary subshell and command invocation t4202: clarify intent by creating expected content less cleverly t1020: avoid aborting entire test script when one test fails t1010: fix unnoticed failure on Windows t/lib-pager: use sane_unset() to avoid breaking &&-chain