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A linear dimension clicked from an anchor to a point that is not an anchor (a point on a segment, or a point a Smart Guide gave) followed the art at the anchor end only, so scaling the art turned it into a long slanted dimension. - A point on a segment is stored by its curve parameter on that segment, and stays on it when the segment's anchors or handles are edited. - Any other point is stored against anchors (and, for a path whose anchors lie on one line, handles) of the path under it, or of the path at the other end, and moves, scales, turns and reflects with that path. Beside a path whose anchors and handles all lie on one line, such as a straight line, it keeps its distance along and across the path: a reflection moves it as a half turn does, and a scale that is not uniform moves it as a uniform scale does. - When linked art is reflected, a linear dimension's line goes to the reflected side, except for art whose anchors and handles lie on one line. - Deleting the art, changing its anchor count or whether it is closed, turning an angle's arm into a curve, or making a measured circle or arc no longer circular leaves the dimension where it was, no longer linked, instead of removing it. Undo links it again. Docs: docs/dimensions.md, docs/target-app-parity.md.