magit-diff-file-header no longer applied?

[Dominique Quatravaux]

Hi Marius, Magit users,

it looks like the refactoring in revision c315191639f27 inadvertently
suppressed the application of the magit-diff-file-header text
property. Could you please bring it back?

Cheers,

-- 
  Dominique Quatravaux
  +41 79 609 40 72