- added G.editMesh->derived pointer... idea is to use this for mesh derived from editmesh instead of Mesh->derived (as the derived mesh tends to vary depending on what it came from). This part could be cleaner, also there may problems with it not being invalidated correctly. - And most importantly: In case people were beginning to worry all these edits were just crazy zr stuff, the big point comes about: Incremental subsurf calculation is now enabled. This gives massive speed improvements when editing a large mesh. For the eye-candy happy: try setting G.rt==52 before entering editmode and the edges and vertices (in optimal mode) will switch to displaying visually the age since a region has last been calculated. Lots of fun!