This file is indexed.

/usr/share/gnome-control-center/ui/button-mapping.ui is in gnome-control-center-data 1:3.4.1-0ubuntu1.

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"?>
<interface>
  <!-- interface-requires gtk+ 3.0 -->
  <object class="GtkDialog" id="button-mapping-dialog">
    <property name="width_request">600</property>
    <property name="height_request">450</property>
    <property name="can_focus">False</property>
    <property name="border_width">5</property>
    <property name="title" translatable="yes">Map Buttons</property>
    <property name="resizable">False</property>
    <property name="modal">True</property>
    <property name="default_width">600</property>
    <property name="default_height">450</property>
    <property name="type_hint">dialog</property>
    <property name="has_resize_grip">False</property>
    <child internal-child="vbox">
      <object class="GtkBox" id="top_vbox">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="orientation">vertical</property>
        <property name="spacing">2</property>
        <child internal-child="action_area">
          <object class="GtkButtonBox" id="dialog-action_area1">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="layout_style">end</property>
            <child>
              <placeholder/>
            </child>
            <child>
              <placeholder/>
            </child>
            <child>
              <placeholder/>
            </child>
            <child>
              <object class="GtkButton" id="close_button">
                <property name="label">gtk-close</property>
                <property name="use_action_appearance">False</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="can_default">True</property>
                <property name="receives_default">False</property>
                <property name="use_action_appearance">False</property>
                <property name="use_stock">True</property>
              </object>
              <packing>
                <property name="expand">False</property>
                <property name="fill">False</property>
                <property name="position">3</property>
              </packing>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="pack_type">end</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkVBox" id="shortcuts_vbox">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="spacing">6</property>
            <child>
              <object class="GtkLabel" id="label1">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="xalign">0</property>
                <property name="ypad">12</property>
                <property name="label" translatable="yes">Map buttons to functions</property>
                <attributes>
                  <attribute name="weight" value="bold"/>
                </attributes>
              </object>
              <packing>
                <property name="expand">False</property>
                <property name="fill">True</property>
                <property name="position">0</property>
              </packing>
            </child>
            <child>
              <object class="GtkTable" id="table11">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="column_spacing">5</property>
                <child>
                  <object class="GtkScrolledWindow" id="actions_swindow">
                    <property name="visible">True</property>
                    <property name="can_focus">True</property>
                    <property name="hscrollbar_policy">never</property>
                    <property name="shadow_type">in</property>
                    <child>
                      <object class="GtkTreeView" id="shortcut_treeview">
                        <property name="visible">True</property>
                        <property name="can_focus">True</property>
                        <property name="headers_visible">False</property>
                        <property name="rules_hint">True</property>
                        <child internal-child="selection">
                          <object class="GtkTreeSelection" id="treeview-selection"/>
                        </child>
                      </object>
                    </child>
                  </object>
                </child>
              </object>
              <packing>
                <property name="expand">True</property>
                <property name="fill">True</property>
                <property name="position">1</property>
              </packing>
            </child>
            <child>
              <object class="GtkHBox" id="hbox1">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="border_width">5</property>
                <property name="spacing">12</property>
                <child>
                  <object class="GtkLabel" id="label12">
                    <property name="visible">True</property>
                    <property name="can_focus">False</property>
                    <property name="xalign">0</property>
                    <property name="label" translatable="yes">To edit a shortcut, click the row and hold down the new keys or press Backspace to clear.</property>
                    <property name="justify">fill</property>
                    <property name="wrap">True</property>
                  </object>
                  <packing>
                    <property name="expand">True</property>
                    <property name="fill">True</property>
                    <property name="position">0</property>
                  </packing>
                </child>
              </object>
              <packing>
                <property name="expand">False</property>
                <property name="fill">True</property>
                <property name="position">2</property>
              </packing>
            </child>
          </object>
          <packing>
            <property name="expand">True</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
      </object>
    </child>
    <action-widgets>
      <action-widget response="0">close_button</action-widget>
    </action-widgets>
  </object>
</interface>