bug#51523: 29.0.50; gnus-mime-view-part-externally very slow

[Gregory Heytings]

<6abcac838bb842604d22@heytings.org>
MIME-Version: 1.0
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I attach a better patch, it uses a file-has-change-p function instead of a 
when-file-has-changed macro.
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Content-Type: text/x-diff; name=Read-mailcaps-again-only-when-necessary.patch
Content-Transfer-Encoding: base64
Content-ID: <6abcac838bae8618f52f@heytings.org>
Content-Description: 
Content-Disposition: attachment; 
filename=Read-mailcaps-again-only-when-necessary.patch

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