Improve reciprocity of zooming
Detail: Previously a small (eg. 100x100) sprite being * zoomed in until it fills the screen * zoom 1:1 * zoom in again would lead to a large black border in width as the sprite grew, but not in height. Now ensures the width is clamped to the minimum sprite width. Admin: Submission for the Paint bounty. Version 2.30. Tagged as 'Paint-2_30'
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