Using maven.jar.manifest.classpath.add=true from maven console gives huge Class-Path

When running maven console on a JAR where the manifest classpath is set using maven.jar.manifest.classpath.add=true, the classpath string is not reset between runs. So, if running the jar goal multiple times, the Class-Path attribute will be getting longer and longer, containing multiple copies of the classpath.

This patch of plugin.jelly in maven-jar-plugin:
<j:set var="jarClasspath" value="$

"/>
+ <j:set var="maven.jar.classpath" value=""/>
<j:if test="$

">

fixes the problem but I'm unsure if it will affect something else.