Bug 279553 [FieldAssist] ControlDecoration strange behavior when description text is empty string
Build ID: 3.5RC3 With the following simple code, when I hover over the control decoration, a huge yellow box quickly flashes on the screen and then disappears. I also tried on 3.4.2 and observed the same behavior. Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new GridLayout(1, false)); Text t = new Text(shell, SWT.BORDER); t.setText("hover on decoration ->"); ControlDecoration decoration = new ControlDecoration(t, SWT.RIGHT); decoration.setImage(FieldDecorationRegistry.getDefault() .getFieldDecoration(FieldDecorationRegistry.DEC_INFORMATION).getImage()); decoration.setDescriptionText(""); shell.pack(); shell.open(); while (!isInterrupted() && !shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose();
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ControlDecoration.java
if (!control.isVisible()) {
			return false;
		}
		if (showOnlyOnFocus) {
			return hasFocus;
		}
		return true;
	}
	/*
	 * If in debug mode, print info about adding the specified listener.
	 */
	private void printAddListener(Widget widget, String listenerType) {
		listenerInstalls++;
		if (DEBUG) {
			System.out
					.println("Added listener>>>" + listenerType + " to>>>" + widget); 
		}
	}
	/*
	 * If in debug mode, print info about adding the specified listener.
	 */
	private void printRemoveListener(Widget widget, String listenerType) {
		listenerInstalls--;
		if (DEBUG) {
			System.out
					.println("Removed listener>>>" + listenerType + " from>>>" + widget); 
		}
	}
}