This file is indexed.

/usr/share/gnome-control-center/keybindings/50-mutter-windows.xml is in mutter-common 3.28.1-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8" ?>
<KeyListEntries schema="org.gnome.desktop.wm.keybindings"
                group="system"
                name="Windows"
                wm_name="Mutter"
                package="mutter">

	<KeyListEntry name="activate-window-menu" description="Activate the window menu"/>

	<KeyListEntry name="toggle-fullscreen" description="Toggle fullscreen mode"/>

	<KeyListEntry name="toggle-maximized" description="Toggle maximization state"/>

	<KeyListEntry name="maximize" description="Maximize window"/>

	<KeyListEntry name="unmaximize" description="Restore window"/>

	<KeyListEntry name="close" description="Close window"/>

	<KeyListEntry name="minimize" description="Hide window"/>

	<KeyListEntry name="begin-move" description="Move window"/>

	<KeyListEntry name="begin-resize" description="Resize window"/>

	<KeyListEntry name="toggle-on-all-workspaces"
	              description="Toggle window on all workspaces or one"/>

	<KeyListEntry name="raise-or-lower" description="Raise window if covered, otherwise lower it"/>

	<KeyListEntry name="raise" description="Raise window above other windows"/>

	<KeyListEntry name="lower" description="Lower window below other windows"/>

	<KeyListEntry name="maximize-vertically" description="Maximize window vertically"/>

	<KeyListEntry name="maximize-horizontally" description="Maximize window horizontally"/>

	<KeyListEntry name="toggle-tiled-left"
                      schema="org.gnome.mutter.keybindings"
                      description="View split on left"/>

	<KeyListEntry name="toggle-tiled-right"
                      schema="org.gnome.mutter.keybindings"
                      description="View split on right"/>

</KeyListEntries>