Show tooltip in the Settings tree for the Project icon only.

platform/platform-api/src/com/intellij/ui/treeStructure/Tree.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2013 JetBrains s.r.o.
+ * Copyright 2000-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -828,4 +828,35 @@ public class Tree extends JTree implements ComponentWithEmptyText, ComponentWith
   public void setHorizontalAutoScrollingEnabled(boolean enabled) {
     myHorizontalAutoScrolling = enabled;
   }
+
+  /**
+   * Returns the deepest visible component
+   * that will be rendered at the specified location.
+   *
+   * @param x horizontal location in the tree
+   * @param y vertical location in the tree
+   * @return the deepest visible component of the renderer
+   */
+  @Nullable
+  protected Component getDeepestRendererComponentAt(int x, int y) {
+    int row = getRowForLocation(x, y);
+    if (row >= 0) {
+      TreeCellRenderer renderer = getCellRenderer();
+      if (renderer != null) {
+        TreePath path = getPathForRow(row);
+        Object node = path.getLastPathComponent();
+        Component component = renderer.getTreeCellRendererComponent(this, node,
+                                                                    isRowSelected(row),
+                                                                    isExpanded(row),
+                                                                    getModel().isLeaf(node),
+                                                                    row, true);
+        Rectangle bounds = getPathBounds(path);
+        if (bounds != null) {
+          component.setBounds(bounds); // initialize size to layout complex renderer
+          return SwingUtilities.getDeepestComponentAt(component, x - bounds.x, y - bounds.y);
+        }
+      }
+    }
+    return null;
+  }
 }

platform/platform-impl/src/com/intellij/openapi/options/newEditor/OptionsTree.java

@@ -409,12 +409,11 @@ public class OptionsTree extends JPanel implements Disposable, OptionsEditorColl
         myProjectIcon.setBackground(selected ? getSelectionBackground() : getBackground());
         myProjectIcon.setIcon(selected ? AllIcons.General.ProjectConfigurableSelected : AllIcons.General.ProjectConfigurable);
         myProjectIcon.setVisible(true);
-        tree.setToolTipText(OptionsBundle.message(project.isDefault()
+        myProjectIcon.setToolTipText(OptionsBundle.message(project.isDefault()
                                                   ? "configurable.default.project.tooltip"
                                                   : "configurable.current.project.tooltip"));
       } else {
         myProjectIcon.setVisible(false);
-        tree.setToolTipText(null);
       }
       return result;
     }
@@ -627,6 +626,24 @@ public class OptionsTree extends JPanel implements Disposable, OptionsEditorColl
       setOpaque(true);
     }
 
+    @Override
+    public final String getToolTipText(MouseEvent event) {
+      if (event != null) {
+        Point point = event.getPoint();
+        Component component = getDeepestRendererComponentAt(point.x, point.y);
+        if (component instanceof JLabel) {
+          JLabel label = (JLabel)component;
+          if (label.getIcon() != null) {
+            String text = label.getToolTipText();
+            if (text != null) {
+              return text;
+            }
+          }
+        }
+      }
+      return super.getToolTipText(event);
+    }
+
     @Override
     protected boolean paintNodes() {
       return false;