Caused by rB6da097136cf4.

The file in the report has some parts of the curve object generate faces
[due to success in filling] and some others dont [where filling isnt
possible].

rB6da097136cf4 disabled the wires/curves drawing whenever any faces
would be generated (looks like this is a bit too 'agressive')

So now only skip the wires/curves drawing if we are _not_ in wireframe
viewport shading and the object's viewport display options is above
'WIRE'.

This is an alternative fix to D7594 (and I think the better alternative

• thx @Steve Warner (stevewarner) suggesting this).