manuals: document "mime-xdg" class and MIME_XDG_PACKAGES

(From yocto-docs rev: dabd2e95cf8ba8ed620bfd135deb6cfcf5d74b16)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 0cc73a234c..440e1a0833 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -4894,6 +4894,13 @@ system and gives an overview of their function and contents.
       The revision currently checked out for the OpenEmbedded-Core layer (path
       determined by :term:`COREBASE`).
 
+   :term:`MIME_XDG_PACKAGES`
+      The current implementation of the :ref:`mime-xdg <ref-classes-mime-xdg>`
+      class cannot detect ``.desktop`` files installed through absolute
+      symbolic links. Use this setting to make the class create post-install
+      and post-remove scripts for these packages anyway, to invoke the
+      ``update-destop-database`` command.
+
    :term:`MIRRORS`
       Specifies additional paths from which the OpenEmbedded build system
       gets source code. When the build system searches for source code, it