This file is indexed.

/usr/share/themes/BlackMATE/gtk-3.0/window-controls.css is in mate-themes 3.22.16-4ubuntu1.

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

The actual contents of the file can be viewed below.

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/*left & right not set for ssd by metacity,mutter, g-s, include this case*/
headerbar button.minimize.titlebutton,
headerbar button.maximize.titlebutton,
headerbar button.close.titlebutton,
headerbar button.minimize.titlebutton:backdrop,
headerbar button.maximize.titlebutton:backdrop,
headerbar button.close.titlebutton:backdrop,
/*other WMs*/
headerbar .right button.minimize.titlebutton,
headerbar .right button.minimize.titlebutton:backdrop,
headerbar .right:dir(rtl) button.minimize.titlebutton,
headerbar .right:dir(rtl) button.minimize.titlebutton:backdrop,
headerbar .left button.minimize.titlebutton,
headerbar .left button.minimize.titlebutton:backdrop,
headerbar .left:dir(rtl) button.minimize.titlebutton,
headerbar .left:dir(rtl) button.minimize.titlebutton:backdrop,
headerbar .right button.maximize.titlebutton,
headerbar .right button.maximize.titlebutton:backdrop,
headerbar .right:dir(rtl) button.maximize.titlebutton,
headerbar .right:dir(rtl) button.maximize.titlebutton:backdrop,
headerbar .left button.maximize.titlebutton,
headerbar .left button.maximize.titlebutton:backdrop,
headerbar .left:dir(rtl) button.maximize.titlebutton,
headerbar .left:dir(rtl) button.maximize.titlebutton:backdrop,
headerbar .right button.close.titlebutton,
headerbar .right button.close.titlebutton:backdrop,
headerbar .right:dir(rtl) button.close.titlebutton,
headerbar .right:dir(rtl) button.close.titlebutton:backdrop,
headerbar .left button.close.titlebutton,
headerbar .left button.close.titlebutton:backdrop,
headerbar .left:dir(rtl) button.close.titlebutton,
headerbar .left:dir(rtl) button.close.titlebutton:backdrop {
	color: transparent;
	background-position: center;
	background-repeat: no-repeat;
	background-size: 19px 19px;
}

/* Set correct layout with 
	gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "{'Gtk/DecorationLayout': <':minimize,maximize,close'>}" for
 	buttons on the right or
	gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "{'Gtk/DecorationLayout': <'close,maximize,minimize:'>}"
	for buttons on the left */

/* minimize */

headerbar  button.minimize.titlebutton,
headerbar .right button.minimize.titlebutton,
headerbar .right:dir(rtl) button.minimize.titlebutton,
headerbar .left button.minimize.titlebutton,
headerbar .left:dir(rtl) button.minimize.titlebutton {
	background-image: url('window-controls/neutral.png');
}

headerbar button.minimize.titlebutton:hover,
headerbar .right button.minimize.titlebutton:hover,
headerbar .right:dir(rtl) button.minimize.titlebutton:hover,
headerbar .left button.minimize.titlebutton:hover,
headerbar .left:dir(rtl) button.minimize.titlebutton:hover {
	background-image: url('window-controls/button-min-focus.png');
}

headerbar button.minimize.titlebutton:active,
headerbar .right button.minimize.titlebutton:active,
headerbar .right:dir(rtl) button.minimize.titlebutton:active,
headerbar .left button.minimize.titlebutton:active,
headerbar .left:dir(rtl) button.minimize.titlebutton:active,
headerbar .right button.minimize.titlebutton:checked,
headerbar .right:dir(rtl) button.minimize.titlebutton:checked,
headerbar .left button.minimize.titlebutton:checked,
headerbar .left:dir(rtl) button.minimize.titlebutton:checked {
	background-image: url('window-controls/neutral.png');
}

headerbar  button.minimize.titlebutton:backdrop,
headerbar .right button.minimize.titlebutton:backdrop,
headerbar .right:dir(rtl) button.minimize.titlebutton:backdrop,
headerbar .left button.minimize.titlebutton:backdrop,
headerbar .left:dir(rtl) button.minimize.titlebutton:backdrop {
	background-image: url('window-controls/unfocus.png');
}
/*
headerbar button.minimize.titlebutton:backdrop:hover,
headerbar .right button.minimize.titlebutton:backdrop:hover,
headerbar .right:dir(rtl) button.minimize.titlebutton:backdrop:hover,
headerbar .left button.minimize.titlebutton:backdrop:hover,
headerbar .left:dir(rtl) button.minimize.titlebutton:backdrop:hover {
	background-image: url('window-controls/minimize_unfocused_prelight.png');
}
*/
/* maximize */
headerbar button.maximize.titlebutton,
headerbar .right button.maximize.titlebutton,
headerbar .right:dir(rtl) button.maximize.titlebutton,
headerbar .left button.maximize.titlebutton,
headerbar .left:dir(rtl) button.maximize.titlebutton {
	background-image: url('window-controls/neutral.png');
}

headerbar button.maximize.titlebutton:hover,
headerbar .right button.maximize.titlebutton:hover,
headerbar .right:dir(rtl) button.maximize.titlebutton:hover,
headerbar .left button.maximize.titlebutton:hover,
headerbar .left:dir(rtl) button.maximize.titlebutton:hover {
	background-image: url('window-controls/button-max-focus.png');
}

headerbar button.maximize.titlebutton:active,
headerbar .right button.maximize.titlebutton:active,
headerbar .right:dir(rtl) button.maximize.titlebutton:active,
headerbar .left button.maximize.titlebutton:active,
headerbar .left:dir(rtl) button.maximize.titlebutton:active,
headerbar .right button.maximize.titlebutton:checked,
headerbar .right:dir(rtl) button.maximize.titlebutton:checked,
headerbar .left button.maximize.titlebutton:checked,
headerbar .left:dir(rtl) button.maximize.titlebutton:checked {
	background-image: url('window-controls/neutral.png');
}

headerbar button.maximize.titlebutton:backdrop,
headerbar .right button.maximize.titlebutton:backdrop,
headerbar .right:dir(rtl) button.maximize.titlebutton:backdrop,
headerbar .left button.maximize.titlebutton:backdrop,
headerbar .left:dir(rtl) button.maximize.titlebutton:backdrop {
	background-image: url('window-controls/unfocus.png');
}
/*
headerbar button.maximize.titlebutton:backdrop:hover,
headerbar .right button.maximize.titlebutton:backdrop:hover,
headerbar .right:dir(rtl) button.maximize.titlebutton:backdrop:hover,
headerbar .left button.maximize.titlebutton:backdrop:hover,
headerbar .left:dir(rtl) button.maximize.titlebutton:backdrop:hover {
	background-image: url('window-controls/maximize_unfocused_prelight.png');
}
*/
/* close */


headerbar button.close.titlebutton,  /*Include Metacity/Mutter/G-S close button  */
headerbar .right button.close.titlebutton,
headerbar .right:dir(rtl) button.close.titlebutton,
headerbar .left button.close.titlebutton,
headerbar .left:dir(rtl) button.close.titlebutton {
	background-image: url('window-controls/neutral.png');
	/*padding: 2px 6px 3px 3px;*/ /* FIXME: Uncomment this shit when using the Faenza icon theme and maybe some other icon themes */
}

headerbar button.close.titlebutton:hover,
headerbar .right button.close.titlebutton:hover,
headerbar .right:dir(rtl) button.close.titlebutton:hover,
headerbar .left button.close.titlebutton:hover,
headerbar .left:dir(rtl) button.close.titlebutton:hover {
	background-image: url('window-controls/button-close-focus.png');
}

headerbar button.close.titlebutton:active,
headerbar .right button.close.titlebutton:active,
headerbar .right:dir(rtl) button.close.titlebutton:active,
headerbar .left button.close.titlebutton:active,
headerbar .left:dir(rtl) button.close.titlebutton:active,
headerbar .right button.close.titlebutton:checked,
headerbar .right:dir(rtl) button.close.titlebutton:checked,
headerbar .left button.close.titlebutton:checked,
headerbar .left:dir(rtl) button.close.titlebutton:checked {
	background-image: url('window-controls/neutral.png');
}

headerbar button.close.titlebutton:backdrop,
headerbar .right button.close.titlebutton:backdrop,
headerbar .right:dir(rtl) button.close.titlebutton:backdrop,
headerbar .left button.close.titlebutton:backdrop,
headerbar .left:dir(rtl) button.close.titlebutton:backdrop {
	background-image: url('window-controls/unfocus.png');
}
/*
headerbar button.close.titlebutton:backdrop:hover,
headerbar .right button.close.titlebutton:backdrop:hover,
headerbar .right:dir(rtl) button.close.titlebutton:backdrop:hover,
headerbar .left button.close.titlebutton:backdrop:hover,
headerbar .left:dir(rtl) button.close.titlebutton:backdrop:hover {
	background-image: url('window-controls/close_unfocused_prelight.png');
}
*/

.titlebar button.close.titlebutton image {
    /* fake request     to avoid usage of regular window-close button*/
    -gtk-icon-style: requested;
}

/* gtk+-3.20 */ 
.titlebar button.close.titlebutton image,
.titlebar button.minimize.titlebutton image,
.titlebar button.maximize.titlebutton image {
        color: transparent;
}

/* Menu button when fallback kicks in (XFCE, Cinnamon etc.) *//*

.titlebar .button.popup.titlebutton {
	background-image: url('window-controls/neutral.png');
}

.titlebar .button.popup.titlebutton:hover {
	background-image: url('window-controls/yellow.png');
}

.titlebar .button.popup.titlebutton:active {
	background-image: url('window-controls/menu-button-pressed.png');
}
*/