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Find the break position for the cell at the given slot index. Returns the break position and its index in cellBreakPositions, or null if not found. Uses sourceNode matching instead of sequential index to support layout retry (issue #1663).
Find the break position for the cell at the given slot index. Returns the break position and its index in cellBreakPositions, or null if not found. Uses sourceNode matching instead of sequential index to support layout retry (issue #1663).