Bug 265422 [FieldAssist] Field assist hint popup border is black
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/DecoratedField.java
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
/**
 * DecoratedField manages image decorations around a control. It allows clients
 * to specify an image decoration and a position for the decoration relative to
 * the field. Decorations may be assigned descriptions, which are shown when the
 * user hovers over the decoration. Clients can decorate any kind of control by
 * supplying a {@link IControlCreator} to create the control that is decorated.
 * <p>
 * Decorations always appear on either horizontal side of the field, never above
 * or below it. Decorations can be positioned at the top or bottom of either
 * side. Future implementations may provide additional positioning options for
 * decorations.
 * <p>
 * By default, DecoratedField will consult the {@link FieldDecorationRegistry}
 * to determine how much space should be reserved for each decoration. This
 * allows fields with decorations from different sources to align properly on
 * the same dialog, since the registry tracks the size of all decorations
 * registered. Therefore, it is recommended, but not required, that clients of
 * DecoratedField register the decorations used. In cases where alignment