T22136, T22159: Fix for 3D-interpolation crash on closing plugin or deleting data #166
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If you close working data or segmentation plugin when 3d-interpolation is in progress, this will lead to crash. This happens because QFuture will still be running but there will be no data for it.
This PR adds waiting for future's complete before deleting node or closing plugin.
Signed-off-by: KuznetsovAlexander KuznetsovAlexander@rambler.ru