8353007: Open some JComboBox bugs 2

[alisenchung]

Updating and opening some tests

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Progress

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Issue

• JDK-8353007: Open some JComboBox bugs 2 (Bug - P4)

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Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk.git pull/24496/head

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[openjdk]

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[mlbridge]

Webrevs

• 02: Full - Incremental (24f40ddf)
• 01: Full - Incremental (97c86bb9)
• 00: Full (e5a9f295)

[honkar-jdk]

@alisenchung
jtreg path updated but couple of suggestions are pending update yet.

[prrace]

Usually we treat this an automatic failure -eg JPassFailJFrame.forceFail("...")