This file is indexed.

/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.defaultPanel/contents/layout.js is in plasma-desktop 4:4.8.5-0ubuntu0.4.

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The actual contents of the file can be viewed below.

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var panel = new Panel
if (panelIds.length == 1) {
    // we are the only panel, so set the location for the user
    panel.location = 'bottom'
}

panel.height = screenGeometry(panel.screen).height > 1024 ? 35 : 27
panel.addWidget("launcher")
panel.addWidget("org.kde.showActivityManager")
panel.addWidget("pager")
tasks = panel.addWidget("tasks")
panel.addWidget("systemtray")
panel.addWidget("digital-clock")

tasks.currentConfigGroup = new Array("Launchers")
tasks.writeConfig("browser", "preferred://browser, , , ")
tasks.writeConfig("filemanager", "preferred://filemanager, , , ")