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  • Stan Hu's avatar
    Fix slow Markdown rendering · 66b25e076c25
    Stan Hu authored
    The sanitize transformers were being duplicated each time the Markdown
    renderer was called, leading to expontential growth in rendering times.
    
    The problem was that although HTML::Pipeline::SanitizationFilter.WHITELIST
    is a frozen hash, the `:transformers` array can be modified. We need
    to do deep copy of this to avoid adding duplicates.
    
    Closes #49409
    66b25e076c25