[Bug 70924] patch file contents detected as Glade XML

[Joachim Noreiko]

Public bug reported:

I have a file that is a patch on a Glade XML file.
Trying to open this in Nautilus warns of a mismatch between extension and contents:

The filename "tools.glade.shortcut.patch" indicates that this file is of
type "differences between files". The contents of the file indicate that
the file is of type "Glade project".

** Affects: shared-mime-info (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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patch file contents detected as Glade XML
https://launchpad.net/bugs/70924