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e0970c19d5
When a text shape is decoded from the server via map->Rect (which bypasses make-rect's 0.01 minimum enforcement), its selrect can have width or height of exactly 0. change-dimensions-modifiers and change-size were dividing by these values, producing Infinity scale factors that propagated through the transform pipeline until calculate-selrect / center->rect returned nil, causing gpt/point to throw 'invalid arguments (on pointer constructor)'. Fix: before computing scale factors, guard sr-width / sr-height (and old-width / old-height in change-size) against zero/negative and non-finite values. When degenerate, fall back to the shape's own top-level :width/:height so the denominator and proportion-lock base remain consistent. Also simplify apply-text-modifier's delta calculation now that the transform pipeline is guaranteed to produce a valid selrect, and update the test suite to test the exact degenerate-selrect scenario that triggered the original crash. Signed-off-by: Andrey Antukh <niwi@niwi.nz>