Code review comment for lp:~mzanetti/unity8/fix-preview-collapsing

FAILED: Autolanding.
More details in the following jenkins job:
http://jenkins.qa.ubuntu.com/job/unity8-autolanding/451/
Executed test runs:
    SUCCESS: http://s-jenkins:8080/job/generic-cleanup-mbs/2267
    SUCCESS: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-saucy/3547
    UNSTABLE: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-touch/1075
    SUCCESS: http://jenkins.qa.ubuntu.com/job/unity-phablet-qmluitests-saucy/1741
    SUCCESS: http://jenkins.qa.ubuntu.com/job/unity8-saucy-amd64-autolanding/37
    SUCCESS: http://jenkins.qa.ubuntu.com/job/unity8-saucy-armhf-autolanding/455
        deb: http://jenkins.qa.ubuntu.com/job/unity8-saucy-armhf-autolanding/455/artifact/work/output/*zip*/output.zip
    SUCCESS: http://jenkins.qa.ubuntu.com/job/unity8-saucy-i386-autolanding/456
    SUCCESS: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-builder-saucy-i386/3559
        deb: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-builder-saucy-i386/3559/artifact/work/output/*zip*/output.zip
    SUCCESS: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-runner-saucy/3006
    SUCCESS: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-builder-saucy-armhf/1077
        deb: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-builder-saucy-armhf/1077/artifact/work/output/*zip*/output.zip
    SUCCESS: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-runner-maguro/895
    UNSTABLE: http://jenkins.qa.ubuntu.com/job/generic-mediumtests-runner-mako/907