Reimplement a feature that was lost when porting the ToolTipOtem
to QtQuick. This is a bit of a longer commit, because the icon
of the event is now drawn explicitly, instead of using HTML.
This encompasses a UI change: the icon is now the icon shown
on the profile and not a general "warning" icon.
This commit also fixes update of the tooltip when panning the
profile.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Still behaves weirdly when panning the chart.
No support for moving the ToolTipItem.
Doesn't add information on bookmarks under the mouse cursor.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
