Commit d9dca1ee (tdf#102308 sw: improve
redline timestamp precision) improved the manage changes dialog to show
seconds of the redline timestamps, do the same with tooltips, when the
mouse is hovered over a redline portion.

Change-Id: I6ec42db49cb93d8bce0cdee02e37d871f8e7e2ce
Reviewed-on: https://gerrit.libreoffice.org/30515Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>