Bug 328261 [Compatibility] Content description of 3.x parts should have tooltips
Since the text may be truncated if it's very long, hovering over the label with the mouse should provide a tooltip of the text. This mirrors the behaviour on 3.x.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/ContributedPartRenderer.java
Label label = (Label) composite.getChildren()[0];
						Control partCtrl = composite.getChildren()[1];
						int labelHeight = label.computeSize(bounds.width,
								SWT.DEFAULT).y;
						label.setBounds(0, 0, bounds.width, labelHeight);
						partCtrl.setBounds(0, labelHeight, bounds.width,
								bounds.height - labelHeight);
					}
				}
			});
			Control partCtrl = c.getChildren()[0];
			Label label = new Label(c, SWT.NONE);
			label.setText(description);
			label.moveAbove(partCtrl);
			c.layout();
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer#requiresFocus
	 * (org.eclipse.e4.ui.model.application.ui.basic.MPart)
	 */
	@Override
	protected boolean requiresFocus(MPart element) {
		if (element == partToActivate) {
			return true;
		}
		return super.requiresFocus(element);