Do not draw super-tiny meshes (less than 2.5 pixels squared).
This was set at 0.5, but since it's computed based on the bounding disc, and it usually is bigger than the mesh itself, 0.5 was overly conservative. 2.5 gives better empirical results.
Authored by: klaussfreire 2011-12-26
Parent: [r13271]
Child: [r13273]