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This is a simple change, but the code might need more refactoring as currently if any invalid emphasis is detected, the entire text rendering is skipped. I'd like to have it so that invalid/unsupported emphasis is drawn with a red background so that it is clearer to the user when errors happen instead of just hiding the text completely. That feature was out of the scope of this PR, though I can add it in a separate PR if this idea sounds like something worth pursuing.