make signaturehelp traverse characters safely #894
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setting an empty filename led to incorrect range comparisons, so we need a SourceText that knows its tagged fileName
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While investigating #891 (comment), @quantum-booty had a log line that suggested
textDocument/signatureHelpwasn't traversing positions safely. This turned out to be the case, so I've pushed helper functions for safe incrementing and decrementing of positions down into the SourceText extensions, then updated the implementation of SignatureHelp to use these.