Infinite loop occurs in vocabularies #2956
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Fixes #2955
Summary
If "System.Net.WebUtility.HtmlDecode" returns the same value as the input, it will cause an infinite loop because of the while loop. There are no needs for a while loop here since it's enough for "System.Net.WebUtility.HtmlDecode" to work only once.
Demo: https://drive.google.com/open?id=1nG5P1_drh8Ncx-AvwNcSDI1MANxAz9Ve
Note: The retargeted PR (for release/9.4.x) can be found in #2956