Delete face: exact bodies for the shapes that are still meshes

[mlugo-apx]

@henmedia here is what I use Delete face for, and where it stops.

Use case: two objects combined, with part of one sticking out of the other, for example a box with a long wedge through it that sticks out on two sides.

• Before Delete face: a box set to hole had to be sized and lined up over each piece that sticks out, then grouped with the rest.
• With Delete face: group the two, open Delete face, click the faces of the piece that sticks out, Delete. The faces around them close the gap.

Where it stops: with a Wedge from the shape list, Delete face refuses the group: "This body has no exact faces to delete". The wedge has no exact body, only its mesh, and Delete face takes no part as a mesh, while the edge tool accepts the wedge's flat-faced mesh (#74). Drawn as sketches instead, a wedge and a square combined work: Delete face takes the faces of the wedge where it sticks out.

I checked every shape in the catalogue with its default settings on 1.117.2, with every gear type, thread role, Gridfinity type and hinge style: the wedge, pyramid, paraboloid, ruler, vase, the herringbone gear and the hinge with cones have no exact body for Delete face; all the others have one. One such part is enough for Delete face to refuse the whole group, so every shape that can be combined should have one.

May I give an exact body to the wedge, pyramid, ruler (in the body a plain box), paraboloid, herringbone gear and the hinge with cones, following the rules from #74: the mesh stays for display and as the fallback, the exact body is built only when it is needed, nothing new in the .lyl file, and a kernel e2e test plus a check in the browser? The vase I would leave to @marcus040473: its reliefs are a mesh by nature.

[henmedia]

@mlugo-apx Yes, please go ahead, with the rules from #74 as you describe them. Thank you for checking the whole catalogue.

Two things to keep in mind:

• The hinge was just changed by Hinge: screw holes, rounded corners and fingers instead of leavesHinge screws fingers #999 (screw holes, fingers, and cones as thick as the knuckle). Please start from the current layerling branch, so the exact body of the cone hinge covers the fingers too.
• For the herringbone gear, please measure how long the kernel takes. With the crossed knurl, an exact body made from two twisted solids took 7 s for 12 grooves and 43 s for 30, so we kept it a mesh. If the gear behaves the same way, it is fine to leave it out and say so in the PR.

Leaving the vase to @marcus040473 is right.