Hello, My previous issue with applying the tube filter to polydata lines has been solved, although there may be a bug that can be looked at in future releases.
The problem came up on a linux machine on which the drop down filter menu stretched required scrolling. The Tube filter is well down this menu and appeared greyed out and therefore unselectable. However if I search for the filter using the alternative menu choice, I can apply the tube filter successfully to the line object. After that it is possible to access the Tube filter via the "Recent" menu option. I haven't tested with alternative window manager configurations, but did notice that I didn't have the same problem when displaying via X on a mac (with a much bigger screen).
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