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The function that formats and prints the squigly line that hilights errors counted tabs as spaces, which resulted in incorrect error messages when tabs were used for indentation. This change compares the highlight line with the previous line and inserts a tab instead of a space whenever such a tab exists on the previous line. Note that error messages will still highlight incorrectly when the previous line include characters that require more than one utf8 code point, as mentioned in issue 3260.
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Am I correct in that this handles tabs before the highlighted range, but does not handle tabs in the highlighted range? (Won't matter much in practice since tabs are usually for indentation, but just for completeness.) |
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Now that you mention it, this fix does not handle that case properly. However I can't think of a way to fix that without knowing the length of a tab in advance. I'm reluctant to make an assumption here, as a highlighted range that is too long may be much more confusing that one that is too short. |
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A simple fix for issue 2174.