When you remove track points (either manually or by applying some filters),
they are still kept in the track but marked as filtered. If View |
Filtered points is on, those points are gray in the Points list
and the adjacent edges are displayed as black dash-dot lines.
If a filtered point seems to be good, it can be restored back. If you
are sure that all filtered points are invalid, you can completely delete
them all by choosing Filter | Delete filtered points.
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