This file is indexed.

/usr/share/gnome-control-center/keybindings/50-mutter-navigation.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="Navigation"
                wm_name="Mutter"
                package="mutter">

	<KeyListEntry name="move-to-workspace-1"
	              description="Move window to workspace 1" />

	<KeyListEntry name="move-to-workspace-2"
	              description="Move window to workspace 2" />

	<KeyListEntry name="move-to-workspace-3"
	              description="Move window to workspace 3" />

	<KeyListEntry name="move-to-workspace-4"
	              description="Move window to workspace 4" />

        <KeyListEntry name="move-to-workspace-last"
                      description="Move window to last workspace" />

	<KeyListEntry name="move-to-workspace-up"
	              description="Move window one workspace up" />

	<KeyListEntry name="move-to-workspace-down"
	              description="Move window one workspace down" />

	<KeyListEntry name="move-to-monitor-left"
	              description="Move window one monitor to the left" />

	<KeyListEntry name="move-to-monitor-right"
	              description="Move window one monitor to the right" />

	<KeyListEntry name="move-to-monitor-up"
	              description="Move window one monitor up" />

	<KeyListEntry name="move-to-monitor-down"
	              description="Move window one monitor down" />

	<KeyListEntry name="switch-applications"
	              reverse-entry="switch-applications-backward"
	              description="Switch applications"/>

	<KeyListEntry name="switch-applications-backward"
	              reverse-entry="switch-applications"
	              hidden="true"
	              description="Switch to previous application"/>

	<KeyListEntry name="switch-windows"
	              reverse-entry="switch-windows-backward"
	              description="Switch windows"/>

	<KeyListEntry name="switch-windows-backward"
	              reverse-entry="switch-windows"
	              hidden="true"
	              description="Switch to previous window"/>

	<KeyListEntry name="switch-group"
	              reverse-entry="switch-group-backward"
	              description="Switch windows of an application"/>

	<KeyListEntry name="switch-group-backward"
	              reverse-entry="switch-group"
	              hidden="true"
	              description="Switch to previous window of an application"/>

	<KeyListEntry name="switch-panels"
	              reverse-entry="switch-panels-backward"
	              description="Switch system controls"/>

	<KeyListEntry name="switch-panels-backward"
	              reverse-entry="switch-panels"
	              hidden="true"
	              description="Switch to previous system control"/>

	<KeyListEntry name="cycle-windows"
	              reverse-entry="cycle-windows-backward"
	              description="Switch windows directly"/>

	<KeyListEntry name="cycle-windows-backward"
	              reverse-entry="cycle-windows"
	              hidden="true"
	              description="Switch directly to previous window"/>

	<KeyListEntry name="cycle-group"
	              reverse-entry="cycle-group-backward"
	              description="Switch windows of an app directly"/>

	<KeyListEntry name="cycle-group-backward"
	              reverse-entry="cycle-group"
	              hidden="true"
	              description="Switch directly to previous window of an app"/>

	<KeyListEntry name="cycle-panels"
	              reverse-entry="cycle-panels-backward"
	              description="Switch system controls directly"/>

	<KeyListEntry name="cycle-panels-backward"
	              reverse-entry="cycle-panels"
	              hidden="true"
	              description="Switch directly to previous system control"/>

	<KeyListEntry name="show-desktop"
	              description="Hide all normal windows"/>

	<KeyListEntry name="switch-to-workspace-1"
	              description="Switch to workspace 1" />

	<KeyListEntry name="switch-to-workspace-2"
	              description="Switch to workspace 2" />

	<KeyListEntry name="switch-to-workspace-3"
	              description="Switch to workspace 3" />

	<KeyListEntry name="switch-to-workspace-4"
	              description="Switch to workspace 4" />

	<KeyListEntry name="switch-to-workspace-last"
	              description="Switch to last workspace" />

	<KeyListEntry name="switch-to-workspace-up"
	              description="Move to workspace above" />

	<KeyListEntry name="switch-to-workspace-down"
	              description="Move to workspace below" />

</KeyListEntries>