The PerspectiveSwitcher respects the IPresentationEngine.NO_MOVE tag on

its MToolControl.

Drag and drop reordering of perspective items is now prevented if the
Perspective Switcher tool control has the NoMove tag.

Example usage (programmatic):

// To lock the perspective switcher reordering:
toolControl.getTags().add(IPresentationEngine.NO_MOVE);
// To unlock:
	toolControl.getTags().remove(IPresentationEngine.NO_MOVE);

Otherwise: use the e4 model spy to set this tag

Author: vogella

bundles/org.eclipse.ui.workbench/eclipseui/org/eclipse/e4/ui/workbench/addons/perspectiveswitcher/PerspectiveSwitcher.java

@@ -49,6 +49,7 @@
 import org.eclipse.e4.ui.model.application.ui.basic.MTrimBar;
 import org.eclipse.e4.ui.model.application.ui.basic.MWindow;
 import org.eclipse.e4.ui.model.application.ui.menu.MToolControl;
+import org.eclipse.e4.ui.workbench.IPresentationEngine;
 import org.eclipse.e4.ui.workbench.UIEvents;
 import org.eclipse.e4.ui.workbench.modeling.EModelService;
 import org.eclipse.jface.preference.IPreferenceStore;
@@ -454,6 +455,9 @@ public void mouseDown(MouseEvent e) {
 				// We're only interested if the button went down over a
 				// perspective item
 				if (downItem != null && downItem.getData() instanceof MPerspective) {
+					if (perspSwitcherToolControl.getTags().contains(IPresentationEngine.NO_MOVE)) {
+						return;
+					}
 					dragItem = downItem;
 				}
 			}