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The pane scrolled only by hand: past a screenful of slides, arrow-key navigation left the current thumbnail out of view. When the slide changes, the pane now scrolls it into view - minimally, only once the thumbnail has left the viewport, as in PowerPoint, so a visible thumbnail never moves the pane and the user's own scrolling stands. The pane's scroll offset is recorded in UiState (skipped by serde) for the control channel and tests.