/usr/share/appdata/ is in gedit-plugins 3.18.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/appdata/gedit-bookmarks.metainfo.xml
/usr/share/appdata/gedit-bracketcompletion.metainfo.xml
/usr/share/appdata/gedit-charmap.metainfo.xml
/usr/share/appdata/gedit-codecomment.metainfo.xml
/usr/share/appdata/gedit-colorpicker.metainfo.xml
/usr/share/appdata/gedit-colorschemer.metainfo.xml
/usr/share/appdata/gedit-commander.metainfo.xml
/usr/share/appdata/gedit-dashboard.metainfo.xml
/usr/share/appdata/gedit-drawspaces.metainfo.xml
/usr/share/appdata/gedit-findinfiles.metainfo.xml
/usr/share/appdata/gedit-git.metainfo.xml
/usr/share/appdata/gedit-joinlines.metainfo.xml
/usr/share/appdata/gedit-multiedit.metainfo.xml
/usr/share/appdata/gedit-smartspaces.metainfo.xml
/usr/share/appdata/gedit-synctex.metainfo.xml
/usr/share/appdata/gedit-terminal.metainfo.xml
/usr/share/appdata/gedit-textsize.metainfo.xml
/usr/share/appdata/gedit-wordcompletion.metainfo.xml
/usr/share/appdata/gedit-zeitgeist.metainfo.xml