Fix IDE formatting of correctly formatted files with trailing newlines #9683
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Since D60978552, we special-case removing a range of lines during IDE formatting so that T188437747 does not rear its ugly head. However, when document-formatting a file that is already correctly formatted save for some spurious trailing newlines, this logic ends up consuming the last non-newline line. So, only shift the start offset if the last changed line wasn't a trailing line that got removed. Add a test and wire up `hh_single_ide_format` with the OSS dune build so that IDE format tests can be run.
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Since D60978552, we special-case removing a range of lines during IDE formatting so that T188437747 does not rear its ugly head. However, when document-formatting a file that is already correctly formatted save for some spurious trailing newlines, this logic ends up consuming the last non-newline line. So, only shift the start offset if the last changed line wasn't a trailing line that got removed.
Add a test and wire up
hh_single_ide_formatwith the OSS dune build so that IDE format tests can be run.