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fix AnsiHighlighter::highlightData() with valid definition, but without any context

Jonathan Poelen requested to merge jpoelen/syntax-highlighting:segfault_ansi into master

When there is no context, AnsiHighlighter::applyFormat() is used with no value in ansiStyles which results in out-of-bounds access.

The other 2 commits are to reduce allocations, but this is not noticeable.

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