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
paintListener = new PaintListener() {
			public void paintControl(PaintEvent event) {
				Control control = (Control) event.widget;
				Rectangle rect = getDecorationRectangle(control);
				if (shouldShowDecoration()) {
					event.gc.drawImage(getImage(), rect.x, rect.y);
				}
			}
		};
		
		
		mouseMoveListener = new MouseMoveListener() {
			public void mouseMove(MouseEvent event) {
				if (showHover) {
					if (!decorationRectangle.contains(event.x, event.y)) {
						hideHover();
						
						printRemoveListener(event.widget, "MOUSEMOVE"); 
						((Control) event.widget)
								.removeMouseMoveListener(mouseMoveListener);
						moveListeningTarget = null;
					}
				}
			}
		};
		
		mouseTrackListener = new MouseTrackListener() {
			public void mouseExit(MouseEvent event) {
				
				Control target = (Control) event.widget;