RFR: 8306575: Clean up and open source four Dialog related tests

[lawrence.andrews]

On Fri, 21 Apr 2023 21:11:46 GMT, Alexander Zuev <kizune at openjdk.org> wrote:

> Cleaned up and stabilized four Dialog-related tests.

test/jdk/java/awt/Dialog/ModalDialogOnNonEdt.java line 47:

> 45: 
> 46: public class ModalDialogOnNonEdt {
> 47:     public void start () {

Can you leave a blank line here

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PR Review Comment: https://git.openjdk.org/jdk/pull/13592#discussion_r1174173864