Bug 93245 [Dialogs] Error messages show up in two locations in the properties dialog
Force an error message: 1) select a Java project 2) open the properties dialog 3) navigate to Java Compiler>Building 4) enable project specific settings 5) enter a letter into the maximum number of problems field ->the error message shows up at the bottom 6) resize the dialog ->the error message also shows up in the banner
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/DialogMessageArea.java
else {
            lastMessageText = newMessage;
            setMessageColors(JFaceColors.getBannerBackground(messageComposite
                    .getDisplay()));
        }
    }
    /**
     * Set the colors of the message area.
     * 
     * @param color
     *            The color to be use in the message area.
     */
    private void setMessageColors(Color color) {
        messageText.setBackground(color);
        messageComposite.setBackground(color);
        messageImageLabel.setBackground(color);
    }
    /**
     * Clear the error message. Restore the previously displayed message if
     * there is one, if not restore the title label.
     *  
     */
    public void clearErrorMessage() {
        if (lastMessageText == null)
            restoreTitle();
        else
            updateText(lastMessageText, lastMessageType);
    }
}