05142b3ea8
With two viewports, and one viewport with overlays turned off, one viewport first requests positions without calculating loose geometry, then the second viewport can request the loose geometry index buffer. In that case the previously-calculated positions VBO has the wrong size. To fix this, always calculate loose geometry when the positions are requested. That's required because we no simple way of checking whether the previously uploaded positions included loose geometry. That was the state before recent refactors in this area anyway. This makes it clear that the optimization to not calculate loose geometry is meaningless, because the positions buffer will always be requested at some point when drawing a mesh.
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