tmf: Avoid unnecessary redraw in TmfClosestDataPointTooltipProvider
On a mouseMove event, it is only necessary to redraw (once) if the hover
highlight needs to be removed.
Change-Id: Ib14d35699ef276929ec66e84775d0350268e9717
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/65907
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
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