dialpad appears on merging two calls

image r191

1. Dial number A, make sure call is picked.
2. Dial number B, make sure call is picked.
3. Merge the two calls

What happens:
Calls are merged but the Dialpad appears over the call with no way of hiding it, hence there is no way to put any call on hold or end the party.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: dialer-app (not installed)
ProcVersionSignature: Ubuntu 3.19.0-14.14-generic 3.19.3
Uname: Linux 3.19.0-14-generic x86_64
ApportVersion: 2.17.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr 20 23:10:05 2015
InstallationDate: Installed on 2015-02-27 (52 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150226)
SourcePackage: dialer-app
UpgradeStatus: No upgrade log present (probably fresh install)