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* Arabic letters join across a change of formatting (#4093) Each run of a paragraph was shaped on its own, so a letter at a run's edge took the form of a word's start or end. A coloured letter stood apart from its word, and a word edited with Track Changes on read with a space in it (ال ذكاء). Runs are now shaped with the text shown on either side of them, through the shaper's pre- and post-context (fonts::ShapeContext). Runs left out of the layout (hidden text, deletions in a final view) are skipped, so letters join what is on the page. Only paragraphs with a joining script do the work. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LvG6E2QwHfTULQtWYgVEXk * #4093 review: no letter joins a drop cap formatted on its own A drop cap letter in a run of its own (coloured, say) was still passed to the next run as the text before it, so that run's first letter joined the drop cap, which is drawn apart from the word. The shown text now has a floor past the drop cap, and no run takes context from before it. The drop cap test also covers the letter in a run of its own. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LvG6E2QwHfTULQtWYgVEXk --------- Co-authored-by: Filip Strajnar <filip.strajnar@proton.me> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Martin Ball <martin.ball@ucscaregroup.co.uk>