the provided PR does not implements 100% of the the rfc but it's better than the current implementation where the view does not understand multipart.
PR https://github.com/apache/jmeter/pull/99
Date: Mon Feb 1 22:26:16 2016 New Revision: 1728019 URL: http://svn.apache.org/viewvc?rev=1728019&view=rev Log: Bug 58955 - Request view http does not correctly display http parameters in multipart/form-data #resolve #99 Bugzilla Id: 58955 Modified: jmeter/trunk/src/protocol/http/org/apache/jmeter/protocol/http/visualizers/RequestViewHTTP.java jmeter/trunk/xdocs/changes.xml
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/3816