Handle invalid UTF-8 in source code #393
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At the moment if invalid UTF-8 is passed to the source code, then the
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will panic when rendered. This PR changes it to properly decode UTF-8 and handle the invalid data in the usual way (i.e. they will be replaced with �).This can require an extra allocation when rendering
Report
, but only for invalid UTF-8, and only for the "context" area, which is usually small (several lines).This is simply a one-line change, but there are tests to double-check the behaviour of offsets into invalid source. I added some tests for labels into "good" Unicode source and also into "bad" Unicode source. Both seem to behave as expected.