1) Open Impress
2) Click on the slide transition sidebar tab and select a transition
3) Change 'Advance Slide' from 'On mouse click' to 'Automatic after:' and see that the preview happens
Build ID: 72720ac9b934af6f84111ec694fa46555d10a7bd
CPU Threads: 2; OS Version: Linux 4.2; UI Render: default;
TinderBox: Linux-rpm_deb-x86_64@70-TDF, Branch:master, Time: 2016-02-17_19:06:34
Locale: en-US (en_US.UTF-8)
I think its a feature. The preview happens only when the Automatic Preview checkbox is checked.
Not a useful feature if nothing is changing in the preview.
Rishabh committed a patch related to this issue.
It has been pushed to "master":
tdf#98035: Changing 'Advance Slide' options shouldnt start preview
It will be available in 5.2.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.