Lintian tag information: desktop-entry-lacks-main-category (type: warning)

Description (from lintian-explain-tags)

The categories for this desktop entry do not contain any "main"
categories, but only "additional" ones. Additional categories should only
be used on conjunction with one or more main categories.

The desktop-file-validate tool in the desktop-file-utils package may be
useful when checking the syntax of desktop entries.

Please refer to
https://specifications.freedesktop.org/menu-spec/latest/apa.html for
details.

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

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