More font-lock improvements for diff-mode
* lisp/vc/diff-mode.el (diff-font-lock-keywords): Use diff-header face for git index lines (like already used for bzr index lines). Use diff-file-header face for binary file headers. (diff-find-source-location): Use expand-file-name for vc-find-revision. (diff--font-lock-prettify): Use diff-indicator-* faces for left-fringe indicators. (diff-syntax-fontify-props): Optimize to not use text-property-not-all for font-lock-ensure. * lisp/replace.el (occur-engine-line): Simplify to use font-lock-ensure without text-property-not-all.
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