Sketch Mirror, rectangular and circular Pattern, and Offset now show a green live preview that follows the selection and settings; OK commits, Cancel leaves the sketch unchanged. The shared dialogs show the current selection step and source counts, sources can be toggled with Ctrl/Cmd-click, cleared and reselected.
Offsets keep editable driving distance dimensions (One Side, Two Sides, Symmetric) that update the derived curves without moving the source, with undo/redo and save/reopen. Format 19: older files keep their fixed offsets.
New dialog labels in en, zh, ja, de and ko.
Fixes#696. Fixes#517.
Group kernel pieces across circular rims and hidden surface seams for hovering, selection, dialogs, and measurement. Preserve physical references and cover full-item toggling and picking with regression tests.
Fixes#88
Karl Von Richter