4b1b25496b
Prior to this commit, XmlValidationModeDetector did not properly parse all categories of comments (described below). When such categories of comments were encountered XmlValidationModeDetector may have incorrectly detected that an XML file used a DTD when it used an XSD, or vice versa. This commit revises the parsing algorithm in XmlValidationModeDetector so that multi-line comments and multiple comments on a single line are properly recognized. Specifically, with this commit the following categories of comments are now handled properly. - Multiple comments on a single line - Multi-line comment: beginning on one line and then ending on another line with an additional comment following on that same line. - Multi-line comment: beginning at the end of XML content on one line and then spanning multiple lines. Closes gh-27915
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