1. Reduced item icon size.
2. Add slider depending on the number of entries.

Change-Id: I1fad15861438952664c26666afe89fffa08051f6
Reviewed-on: https://gerrit.libreoffice.org/27389Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>