CSSTUDIO-2070 Prevent tool-tips from being displayed using an event-f…

…ilter.

core/ui/src/main/java/org/phoebus/ui/docking/DockStage.java

@@ -22,6 +22,7 @@
 import java.util.logging.Level;
 import java.util.stream.Collectors;
 
+import javafx.scene.input.MouseEvent;
 import org.phoebus.framework.jobs.JobManager;
 import org.phoebus.framework.workbench.Locations;
 import org.phoebus.ui.application.Messages;
@@ -131,6 +132,15 @@ public static DockPane configureStage(final Stage stage, final DockItem... tabs)
      */
     public static DockPane configureStage(final Stage stage, final Geometry geometry, final DockItem... tabs)
     {
+        stage.addEventFilter(MouseEvent.MOUSE_MOVED, mouseEvent -> {
+            // Filtering MOUSE_MOVED events from unfocused windows prevents tooltips
+            // from displaying in unfocused windows. This, in turn, prevents unfocused
+            // windows from receiving the focus as a consequence on Windows and Mac OS.
+            if (!stage.focusedProperty().get()) {
+                mouseEvent.consume();
+            }
+        });
+
         stage.getProperties().put(KEY_ID, createID("DockStage"));
 
         final DockPane pane = new DockPane(tabs);