Comment 0 for bug 1652100

Hi inkscape frezze on node tool unselect, select is about 1/2 sec in my machine, unselect moe than twenty. Hapends in trunk and in =.92.x.

Original reported by CR. I try today to fix and no look, seems deleting __mmap std::map<ShapeRecord, boost::shared_ptr<PathManipulator> > is too slow in this case.

https://www.dropbox.com/s/ayuz04cmz8acpaz/slow_node_tool_switch_problem.svg?dl=0