with the following fixes case 14778 TxAthensLayoutView should not impose a x offset minimal value case 14774 TxHighlightRenderer shapes badly computed when scrolling horizontally case 14719 TxTextLayout startPosition and TxTexLayoutView scrolling management case 14715 TxTextEditorMorph modifies dragged morph position case 14687 TxTextPosition moveDown: can only move one line down