Fix PictureBox StretchImage repaint perf regression by caching scaled bitmap#14559

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LeafShi1:Fix_14009_PictureBox_StretchImage_cache

Commits on May 25, 2026

Fix PictureBox StretchImage repaint perf regression by caching scaled bitmap
LeafShi1
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Optimize PictureBox StretchImage rendering by adding size/interpolation-aware bitmap caching with memory cap and lazy invalidation, while preserving animation behavior and updating tests accordingly.
LeafShi1
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Commits on May 26, 2026

Replace the cached path from DrawImageUnscaled to DrawImage with explicit destination rectangle and GraphicsUnit.Pixel
LeafShi1
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