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Improve typescript error reporting #1161
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Issue: When typing in insert mode, the diagnostics often get into a bad state (showing extra errors)
Defect: We're often overwriting existing lines with the newly-inserted line, and that causes extraneous errors to show up. In other words, our
changeLineInFilemethod inTypeScriptServerHostis causing the document to be out-of-sync.Fix: Tweak the offsets / newline behavior for better results. Also added a
debug.typescript.saveFileflag, which saves the state the typescript server thinks for the file, so it's easier to debug and see this case.