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Changing a list box's options could leave /TI (the first visible row) pointing at a row that moved or no longer exists. A widget's own /TI is read before the field's, and one past the end draws no options at all. set_props now runs the same ListRows::top_showing rule set_value uses (ISO 32000-2 12.7.5.4): /TI stays put while the selected rows are still visible, otherwise it scrolls to them, clamped to the last full page. The field's /TI is updated, and so is every widget that carries its own. The scroll helpers move out of set_value so both paths share them. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9