Considering that kdelibs4c2a isn't supported on anything except lucid (10.04) we're not going to change kdelibs5-plugins.
What I can do is change the breaks/replaces there so that someone can provide a compatible kdelibs4c2a without the conflicting files in a PPA.
It's now breaking kdelibs4c2a << 4:3.5.10.dfsg.1-6~ so feel free to provide a version >> -6~ somewhere that doesn't conflict with the current kde4libs.
Considering that kdelibs4c2a isn't supported on anything except lucid (10.04) we're not going to change kdelibs5-plugins.
What I can do is change the breaks/replaces there so that someone can provide a compatible kdelibs4c2a without the conflicting files in a PPA.
It's now breaking kdelibs4c2a << 4:3.5.10.dfsg.1-6~ so feel free to provide a version >> -6~ somewhere that doesn't conflict with the current kde4libs.