multiple engeines missing widgets in software updater on lxde

[Lyn Perrine]

To reproduce start an lxde desktop with lubuntu on vivid. Then launch customize look and feel under prefrences in switch the widget to clearlooks. Then open software updater and have and notice if it finds updates to try and expand the detail on those updates you will not see the small triangle widget to expand it. Now in customize look and feel in the menu switch back to the default lubuntu in the menu and notice that the widgets reappear.

I expected to see the small rectangular widgets on the update manager.

gtk2-engines:
  Installed: 1:2.20.2-3ubuntu1
  Candidate: 1:2.20.2-3ubuntu1
  Version table:
 *** 1:2.20.2-3ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status
lxappearance:
  Installed: 0.6.1-1
  Candidate: 0.6.1-1
  Version table:
 *** 0.6.1-1 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
        100 /var/lib/dpkg/status

Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04

I expected to see an small triangle to show up when this appears on update to see the updates to lubuntu-core. Instead it did not show up in the clearlooks, crux, industrail, mist, redmond, or thinice themes.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: gtk2-engines 1:2.20.2-3ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.15.1-0ubuntu1
Architecture: amd64
CurrentDesktop: LXDE
Date: Wed Dec 31 12:19:03 2014
InstallationDate: Installed on 2014-09-30 (91 days ago)
InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140930)
SourcePackage: gtk2-engines
UpgradeStatus: Upgraded to vivid on 2014-12-12 (18 days ago)

[Lyn Perrine (walterorlin)]

What it correctly looks like in lubuntu theme.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1406807

[Redwolf (viking.redwolf)]

That dialog works fine in Lubuntu default theme because it has GTK3 support. Those engines you mention are not GTK3, they are GTK2, so the Update Manager (compiled in GTK3) doesn't work fine with them.