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`dx` and `dy` shift a character and every character after it in logical order, but the shifts were accumulated while positioning the clusters in visual order. In right-to-left text, the first character is the last cluster, so a `dy` on a `tspan` only moved its first character, and a multi-line text collapsed onto its first line. Accumulate the shifts in logical order before positioning the clusters. Left-to-right text is unchanged. Fixes linebender#1093
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Right-to-left text with
dyshifts collapsed onto one line. The shifts are now applied in logical order instead of screen order.Fixes #1093
LLM Contributions: investigation, implementation and tests with Claude Code, reviewed by me. The description is my own, edited for grammar.