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The ToggleLinkingAction changes the value of PreferenceConstants.EDITOR_SYNC_OUTLINE_ON_CURSOR_MOVEEDITOR_SYNC_OUTLINE_ON_CURSOR_MOVE. This preference is only used to activate or deactive the link from editor to outline. see : org.eclipse.dltk.internal.ui.editor.ScriptEditor.selectionChanged() The link from outline to editor is always activated. see : org.eclipse.dltk.internal.ui.editor.ScriptEditor.OutlineSelectionChangedListener I think this preference should be used for the link in the both side (like JDT). If you agree with this behaviour, a solution could be to add a check in : org.eclipse.dltk.internal.ui.editor.ScriptEditor.OutlineSelectionChangedListener.selectionChanged(SelectionChangedEvent)