RFR: 8233177: Test case for bug JDK-8001470 fails if there are missing glyphs [v2]

[Prasanta Sadhukhan]

On Fri, 26 Jan 2024 23:08:25 GMT, Phil Race <prr at openjdk.org> wrote:

>> test/jdk/javax/swing/plaf/basic/BasicTextUI/8001470/bug8001470.java line 58:
>> 
>>> 56: 
>>> 57:                 textField1 = new JTextField("\u2588");
>>> 58:                 textField2 = new JTextField("\u2588");
>> 
>> You do not need to test the same character twice
>
> This isn't right. The test MUST use the Indic and Thai characters else the test is pointless.
> The problem of them being unavailable in the font should be solved by using Font.canDisplay(char)
> to find a font that DOES support them.
> If no font supports them, then it becomes a question of policy .. do you want the test to silently pass
> or should the test fail because the system running this test really should have those fonts.

Updated with font canDisplay check

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PR Review Comment: https://git.openjdk.org/jdk/pull/17528#discussion_r1485996650