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
protected void configureShell(Shell shell) {
	super.configureShell(shell);
	if (title != null)
		shell.setText(title);
}
/* (non-Javadoc)
 * Method declared on Dialog.
 */
protected void createButtonsForButtonBar(Composite parent) {
	
	okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
	createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
	
	text.setFocus();
	if (value != null) {
		text.setText(value);
		text.selectAll();
	}
}
/* (non-Javadoc)
 * Method declared on Dialog.
 */
protected Control createDialogArea(Composite parent) {
	
	Composite composite = (Composite)super.createDialogArea(parent);
	
	if (message != null) {
		Label label = new Label(composite, SWT.WRAP);
		label.setText(message);
		GridData data = new GridData(