/usr/share/glib-2.0/schemas/org.gnome.gnome-panel.menu-button.gschema.xml is in gnome-panel-data 1:3.26.0-1ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | <schemalist gettext-domain="gnome-panel">
<schema id="org.gnome.gnome-panel.menu-button">
<key name="tooltip" type="s">
<default>''</default>
<summary>Tooltip displayed for menu</summary>
<description>The text to display in a tooltip for this menu.</description>
</key>
<key name="custom-icon" type="s">
<default>''</default>
<summary>Icon used for button</summary>
<description>The location of the image file used as the icon for the object's button. If empty, the default icon for the menu will be used.</description>
</key>
<key name="menu-path" type="s">
<default>''</default>
<summary>Menu content path</summary>
<description>The path from which the menu contents is constructed. If empty, the menu will be the default applications menu.</description>
</key>
</schema>
</schemalist>
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