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
}
	/**
	 * Add any listeners needed on the target control and on the composite where
	 * the decoration is to be rendered.
	 */
	private void addControlListeners() {
		disposeListener = new DisposeListener() {
			public void widgetDisposed(DisposeEvent event) {
				dispose();
			}
		};
		printAddListener(control, "DISPOSE"); 
		control.addDisposeListener(disposeListener);
		focusListener = new FocusListener() {
			public void focusGained(FocusEvent event) {
				hasFocus = true;
				if (showOnlyOnFocus) {
					update();
				}
			}
			public void focusLost(FocusEvent event) {
				hasFocus = false;
				if (showOnlyOnFocus) {
					update();
				}
			}
		};
		printAddListener(control, "FOCUS"); 
		control.addFocusListener(focusListener);