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          text run at (0,0) width 388: "This tests horizontal caret movement in vertical writing mode."
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          RenderText {#text} at (0,50) size 23x109
            text run at (0,50) width 108 RTL: "\x{5D0}\x{5E0}\x{5D9} \x{5D7}\x{5EA}\x{5D5}\x{5DC}."
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            text run at (0,38) width 120 RTL: "\x{5D0}\x{5D9}\x{5DF} \x{5DC}\x{5D9} \x{5E9}\x{5DD}."
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