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LibreCAD 3 - Document operations
From LibreCAD wiki
LibreCAD 3 has many operations accessible in Lua. You can see the full up-to-date list here.
Builder
The Builder is a container for others Document operations (including Builder itself).
This class is used to prevent the Document being in invalid state on undo/redo. All the operations added to Builder are undo-ed at the same time.