SearchbarExt isn't an official kplugin.
It's to the creator to put the source online if he wants. It have already been asked by Hao, but it seems, without success.
The source for searchbarext is
online, it's the second .z archive on the website.
But that's not the point. My question was for a central plugin repository within the Kmeleon project. Whether or not people use it
to manage their plugin code / releases... that is a different story.
However I think that most plugin creators won't have objections against making the sources available. For most of them it will be more worth to have a code repository, place for releases, bug/request tracker, forum and so on.