Incorrect line depth after point-picking fix

We are seeing a regression in the depth of lines rendered as tubes, after MR !7281 (merged) . Lines are draw in front of polygonal geometry at an incorrect depth. Reproduction in ParaView:

To reproduce:

• Add Box source
• Apply Extract Edges filter
  • set Render Lines as Tubes, Line Width 3
• Add Cone source, change color
• Radius 0.25, Height 0.5, Center 0.25, 0.5, 0.5

Expect the tip of the cone to intersect the tubes at the corner, instead the tube is show in front of the cone well away from the box corner.

Here are screenshots from our commercial client VTK app, with VTK just before and after !7281 (merged):