When launching media from Properties -> Media Playback,
no sound is currently playing. This is due to the fact that
there is no fallback URL defined for MediaWindowImpl.
To fix this problem, new methods have been added for
setting and getting the fallback URL, passing the path to
the presentation folder from "unoshap4.cxx" to
"mediawindow_imp.cxx".
Because the setURL method starts the media immediately,
calls to "setFallbackURL" method must be made BEFORE
calling "setURL".
Change-Id: I3054c90c648c5839a2eb3fc463eaefbf97500c05
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/170644
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins
134fb4747a