jdk11_tier1_iso8859 is subset of jdk_nio, which cause duplicated testcase sun/nio/cs/ISO8859x.java
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Description
**Describe the bug**
jdk11_tier1_iso8859 is subset of jdk_nio, which cause duplicate testcase sun/nio/cs/ISO8859x.java
- jdk_nio in openjdk/playlist.xml:

jdk_nio in TEST.groups:

- jdk11_tier1_iso8859 in openjdk/playlist.xml:

Contributor guide
Research direction
Start by comparing the jdk_nio and jdk11_tier1_iso8859 definitions in openjdk/playlist.xml and their corresponding entries in TEST.groups. Verify where sun/nio/cs/ISO8859x.java is selected by both groups, then confirm the test is selected only once after the configuration is corrected.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- testing-qa
- Issue type
- Bug
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100