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aj
203945dabf
PlateEdits ports the WinForms plate view's edits of the selection, with its undo labels and coalescing: Delete (parts and cut-offs, cut-offs regenerated once when the plate has any), Nudge by the offset increment or one repeat step, Push to contact, Rotate about the selection's centre keeping its lower-left corner (a quarter turn, or by wheel notches at 10 degrees or a tenth of that), repeated nudges and wheel turns undoing as one step. The Select tool drags the selection as one Move step. Cut-offs regenerate when a drag actually moved parts (WinForms also does it on a plain click, adding an extra undo step); the regeneration runs before the step completes, so a failure rolls the drag back, and a view that loses the pointer mid-drag ends the move as a release would, keeping the selection. A plate tool host now has to supply its undo wiring, the nest's cut-off settings and an edits lock (WinForms EditsLocked): while locked no edit runs and no press selects or starts a move.