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* the error message, or <code>null</code> to clear
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public void setMailErrorMessage(String mailErrorMessage) {
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if (errorMessageText != null && !errorMessageText.isDisposed()) {
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errorMessageText.setText(mailErrorMessage == null ? System.getProperty("line.separator") : mailErrorMessage); //$NON-NLS-1$
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// Disable the error message text control if there is no error, or