Modify the boundary-fill algorithm for a 4-connected region to avoid excessive stacking by incorporating scan line methods.

The boundary-fill algorithm is a technique used in computer graphics to color a closed region with a specified interior color. The 4-connected boundary-fill algorithm works by starting from a seed point and filling the region with the interior color until a boundary color is encountered. However, this algorithm can be prone to excessive stacking, especially when dealing with large regions. To address __________ ___ ___ _______ ___ ___.
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