Lintian tag information: menu-icon-not-in-xpm-format (type: error)

Description (from lintian-explain-tags)

The named icon is not in XPM format.

Icons in the Debian menu system should be in XPM format.

While other image types such as PNG seem to work as well, window managers
are not required to support them.

Using such non-XPM icons could break interoperability.

Please refer to The icon field (Section 3.7) in the Debian Menu System and
Bug#591812 for details.

Visibility: error
Show-Always: no
Check: menu-format

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