Inflation in edit mode is different from that in pose mode. In edit mode, you're designing the "default state" of your character. The character in pose mode is "final" and no changes to textures happens at that point (other than some pre-calculated normal map blending). It's by design.
What exactly do you mean it doesn't recalculate shapes properly? What's wrong with the shapes?
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What exactly do you mean it doesn't recalculate shapes properly? What's wrong with the shapes?