Open the Edit Block Definition dialog when BEDIT is invoked without an active selection, listing candidate block definitions alphabetically while filtering layout records, anonymous blocks, and external references. Allow typing a new valid block name to start an empty block editor session that only commits to the drawing block table upon explicit save.
Synchronize the native parametric graph only when replay changes constraints or named parameters. Geometry and visibility history preserve existing imported network identities and ownership. Add a regression for a rejected block copy followed by local undo and redo.
Create a new named definition from current session edits, restore the source checkpoint, and continue editing the copy with fresh local history. Add the name dialog and Save dropdown, clone supported owned metadata onto independent handles, and refuse unsupported relationships atomically.
Karim Jerbi