промежуточный. частичный рефакторинг с прицелом на библиотечную часть

src/Common_old/UI/Trees/SelectableTree.java

@@ -0,0 +1,18 @@
+package Common_old.UI.Trees;
+import Common_old.Current;
+import Common_old.UI.Selectable;
+
+import javax.swing.tree.DefaultMutableTreeNode;
+public class SelectableTree extends DataTree {
+    public SelectableTree(DefaultMutableTreeNode root_in) {
+        super(root_in);
+    }
+    @Override
+    public void LeftMouseAction1() {
+        Object element = Current.get(getCurrent());
+        if ((element instanceof Selectable)) {
+            ((Selectable) element).SwitchSelection();
+            updateUI();
+        }
+    }
+}