RFR: 4138921: TextLayout handling of empty strings

[Phil Race]

On Tue, 26 Aug 2025 17:40:12 GMT, Daniel Gredler <dgredler at openjdk.org> wrote:

> `TextLayout` should deal more gracefully with zero length strings. Currently the exception listed below is the one that is thrown.
> 
> `new TextLayout("", f, new FontRenderContext(null, false, false));`
> 
>> Exception in thread "main" java.lang.IllegalArgumentException: Zero length
>> string passed to TextLayout constructor.
>> at java.lang.Throwable.<init>(Compiled Code)
>> at java.lang.Exception.<init>(Compiled Code)
>> at java.lang.RuntimeException.<init>(Compiled Code)
>> at java.lang.IllegalArgumentException.<init>(Compiled Code)
>> at java.awt.font.TextLayout.<init>(Compiled Code)
>> at test.main(Compiled Code)
> 
> **REVIEWER NOTE:** Please check the empty-string `TextLayout` behavior documented in `TextLayoutConstructorTest` carefully; a badly-behaving empty `TextLayout` is probably worse than a `TextLayout` which doesn't allow empty strings...

Marked as reviewed by prr (Reviewer).

I have updated the CSR and marked it as reviewed. You may now move it to 'finalized'.

-------------

PR Review: https://git.openjdk.org/jdk/pull/26947#pullrequestreview-3181777334
PR Comment: https://git.openjdk.org/jdk/pull/26947#issuecomment-3250166233