Bug 37253 [Dialogs] Font to text control of InputDialog is not set
Look at org.eclipse.jface.dialogs.InputDialog.createDialogArea()
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/InputDialog.java
* Returns the string typed into this input dialog.
 *
 * @return the input string
 */
public String getValue() {
	return value;
}
/**
 * Validates the input.
 * <p>
 * The default implementation of this framework method
 * delegates the request to the supplied input validator object;
 * if it finds the input invalid, the error message is displayed
 * in the dialog's message line.
 * This hook method is called whenever the text changes in the
 * input field.
 * </p>
 */
protected void validateInput() {
	String errorMessage = null;
	if (validator != null) {
		errorMessage = validator.isValid(text.getText());
	}
	
	errorMessageLabel.setText(errorMessage == null ? "" : errorMessage); 
	okButton.setEnabled(errorMessage == null);
	errorMessageLabel.getParent().update();
}
}