Merge pull request #2361 from ControlSystemStudio/patches

#2360 Add a helper method to clean up existing selections

Author: georgweiss

core/framework/src/main/java/org/phoebus/framework/selection/SelectionService.java

@@ -85,4 +85,16 @@ public void setSelection(Object source, Selection selection) {
         for (SelectionChangeListener listener : listeners)
             listener.selectionChanged(source, oldValue, newValue);
     }
+
+    /**
+     * Clear the selection
+     *
+     * @param source    the source of the new selection
+     */
+    public void clearSelection(Object source) {
+        final Selection newValue = SelectionUtil.emptySelection();
+        final Selection oldValue = SelectionService.selection.getAndSet(newValue);
+        for (SelectionChangeListener listener : listeners)
+            listener.selectionChanged(source, oldValue, newValue);
+    }
 }