wire up requestToggleKeepAbove/below

Summary: cobbect requestToggleKeepAbove and below with libtaskmanager

Test Plan: setting keep above from taskbar works

Reviewers: #plasma, hein, graesslin, #plasma_on_wayland

Reviewed By: #plasma, hein, graesslin

Subscribers: graesslin, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D5758

libtaskmanager/waylandtasksmodel.cpp

@@ -530,16 +530,20 @@ void WaylandTasksModel::requestToggleMaximized(const QModelIndex &index)
 
 void WaylandTasksModel::requestToggleKeepAbove(const QModelIndex &index)
 {
-    Q_UNUSED(index)
+    if (!index.isValid() || index.model() != this || index.row() < 0 || index.row() >= d->windows.count()) {
+        return;
+    }
 
-    // FIXME Implement.
+    d->windows.at(index.row())->requestToggleKeepAbove();
 }
 
 void WaylandTasksModel::requestToggleKeepBelow(const QModelIndex &index)
 {
-    Q_UNUSED(index)
+    if (!index.isValid() || index.model() != this || index.row() < 0 || index.row() >= d->windows.count()) {
+        return;
+    }
 
-    // FIXME Implement.
+    d->windows.at(index.row())->requestToggleKeepBelow();
 }
 
 void WaylandTasksModel::requestToggleFullScreen(const QModelIndex &index)