[nextest-runner] handle outputs with/without trailing newlines better #1921
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Previously, our headers would always insert a leading newline to compensate for situations where the output didn't have a trailing newline in it. This isn't quite right (what if the last output doesn't have a newline in it)? It also causes issues with situations where RESET_COLOR needs to be inserted immediately before the last newline. Change our code to always insert a trailing newline, and the trailer immediately before that.
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Previously, our headers would always insert a leading newline to compensate for situations where the output didn't have a trailing newline in it. This isn't quite right (what if the last output doesn't have a newline in it)? It also causes issues with situations where RESET_COLOR needs to be inserted immediately before the last newline.
Change our code to always insert a trailing newline, and the trailer immediately before that.