Update to experimental r13565
Update to experimental r13543
More header cleanup
DrawingContext: change variable names ct to dc (bug #1272073)
Next pass of doxygen @brief cleanup.
Fix rendering glitches appearing when filtered, cached groups have filtered, cached children
Use cache even if only part of the redraw region is clean
Initial autocache work
Per-item render cache. Cache some offscreen data to facilitate smoother navigation.
Add deferred allocation functionality to DrawingSurface
Replace direct use of Cairo contexts and surfaces in the rendering tree with wrappers which keep some extra information about the surface, amd NRRect and NRRectL use with Geom::Rect and Geom::IntRect. Should simplify implementing filter primitive subregions.