On Thu, 9 Jun 2022 02:16:45 GMT, Jeremy <d...@openjdk.java.net> wrote:

>> Previously when you drew a line that moved exactly (+0, +0) with a miter 
>> stroke the Stroker class acted like a horizontal miter was appropriate. Now 
>> we abort instead, so no miter is applied.
>> 
>> The new unit test tests the original steps plus several variations.
>> 
>> I'm a little nervous about this change because it looks like someone 
>> previously considered this exact condition and implemented a different 
>> behavior. I don't think I understand the original rationale.
>
> Jeremy has updated the pull request incrementally with one additional commit 
> since the last revision:
> 
>   JDK-8264999: GeneralPath.lineTo() to itself produces jagged lines
>   
>   Adding "&& prev == DRAWING_OP_TO" per Laurent's code review.
>   
>   I also redid the unit tests. Before this change, with the new unit tests: 
> one scenario failed. With this change: four scenarios failed.
>   
>   For now I've commented out the failing tests. The failing tests are not the 
> same as the original bug; they are related considerations we should also test 
> against, but IMO they are not essential for the resolution of jdk-8264999.

I will try your test code today and see why some tests fail.

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

PR: https://git.openjdk.java.net/jdk/pull/8943

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