Note - when implementing edit tools for vector layer:
All editation should be done between beginEditCommand() and endEditCommand()
calls so that the operation are stored.
Note - when doing changes inside QgsVectorLayer code:
When doing any changes inside QgsVectorLayer they should be done using edit*() functions
and _not_ directly e.g. mChangedGeometries[fid] = (...) otherwise the change won't be
stored in the undo stack and it would lead to invalid behaviour of undo.
git-svn-id: http://svn.osgeo.org/qgis/trunk@10920 c8812cc2-4d05-0410-92ff-de0c093fc19c
7fd5ba816a