/usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/mediacenter/elements/playlist/MultiplePlaylists.qml is in plasma-mediacenter 5.7.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 *   Copyright 2013 Shantanu Tushar <shantanu@kde.org>                     *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
 ***************************************************************************/
import QtQuick 2.1
import org.kde.plasma.components 2.0 as PlasmaComponents
import org.kde.plasma.mediacenter 2.0 as PMC
FocusScope {
    id: multiplePlaylistsRoot
    signal needsFocus
    signal giveUpFocus
    Row {
        id: multiplePlaylistRow
        anchors.fill: parent
        PMC.Settings {
           id: settings
        }
        ListView {
            id: multiplePlaylistList
            width: parent.width - createPlaylistTextField.width - createPlaylistButton.width - removePlaylistButton.width
            height: parent.height
            orientation: ListView.Horizontal
            spacing: 3
            clip: true
            highlightFollowsCurrentItem: true
            highlightMoveDuration: 500
            highlightResizeDuration: 500
            highlight: PlasmaComponents.Highlight { }
            model: PMC.MultiplePlaylistModel {
                playlistModelAddress: pmcInterfaceInstance.playlistModel
            }
            currentIndex: model.currentIndex
            delegate:
            Item {
                id: playlistText
                property string currentPlaylist: display
                height: parent.height
                width: 130
                anchors.verticalCenter: parent.verticalCenter
                Text {
                    id: itemText
                    anchors.fill: parent
                    maximumLineCount : 1
                    color: theme.textColor
                    wrapMode: Text.Wrap
                    horizontalAlignment: Text.AlignHCenter
                    verticalAlignment: Text.AlignVCenter
                    text: display
                }
                MouseArea {
                    anchors.fill: parent
                    onClicked: playlistText.ListView.view.model.switchToPlaylist(itemText.text)
                }
            }
        }
        PlasmaComponents.TextField {
            id: createPlaylistTextField
            visible: false
            anchors.verticalCenter: parent.verticalCenter
            height: 30
            width: visible ? 300 : 1
            clearButtonShown: true
            placeholderText: i18n("Create New Playlist")
            onVisibleChanged: if (visible) {
                multiplePlaylistsRoot.needsFocus();
                createPlaylistTextField.focus = true;
            }
            Keys.onReturnPressed: {
                createPlaylistButton.click();
            }
            Keys.onEscapePressed: {
                text = "";
                createPlaylistButton.click();
            }
        }
        PlasmaComponents.ToolButton {
            id: createPlaylistButton
            iconSource: createPlaylistTextField.visible ? "dialog-ok-apply" : "list-add"
            height: parent.height
            width: height
            anchors.verticalCenter: parent.verticalCenter
            onClicked: click()
            function click() {
                if (createPlaylistTextField.text != "") {
                    multiplePlaylistList.model.createNewPlaylist (createPlaylistTextField.text)
                    createPlaylistTextField.text = ""
                }
                if (createPlaylistTextField.visible) {
                    multiplePlaylistsRoot.giveUpFocus();
                }
                createPlaylistTextField.visible = !createPlaylistTextField.visible;
            }
        }
        PlasmaComponents.ToolButton {
            id: removePlaylistButton
            anchors.verticalCenter: parent.verticalCenter
            height: parent.height
            width: height
            visible: !createPlaylistTextField.visible
            iconSource: "list-remove"
            onClicked: multiplePlaylistList.model.removeCurrentPlaylist ()
        }
    }
}
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