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* test(BlockSvg): Add tests for setParent(null) when dragging Add tests for scenarios where block(s) unrelated to the block being disconnected has/have been marked as as being dragged. Due to a bug in BlockSvg.prototype.setParent, one of these fails in the case that the dragging block is not a top block. Also add a check to assertNonParentAndOrphan to check that the orphan block's SVG root's parent is the workspace's canvass (i.e., that orphan is a top-level block in the DOM too). * fix(BlockSvg): Fix bug in setParent re: dragging block Fix an incorrect assumption in setParent: the topmost block whose root SVG element has the blocklyDragging class may not actually be a top-level block. * refactor(BlockDragStrategy): Hide connection preview earlier * chore(BlockDragStrategy): prefer ?. to !. Per nit on PR #8934. * fix(BlockSvg): Spelling: "canvass" -> "canvas"