Regression in konsole session save/restore

[Lixin Chin]

Similar to Bug #1455323. Session save / restore no longer seems to work at all with konsole.

To duplicate:
-- Start a konsole window.
-- Open multiple tabs in different directories.
-- Have the desktop session set to "restore previous session on login".
-- Logout.
-- Log back in.

All konsole windows will have disappeared, except one, and that one will have only a single tab with the current directory as the home directory.

What should happen (and what did happen under Kubuntu 14.10):
-- Konsole should resume exactly as left off, with the same windows and tabs open to their respective directories.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: konsole 4:14.12.3-0ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Fri May 15 12:50:59 2015
InstallationDate: Installed on 2015-05-04 (10 days ago)
InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
SourcePackage: konsole
UpgradeStatus: No upgrade log present (probably fresh install)