[jdk17u-dev] RFR: 7093691: Nimbus LAF: disabled JComboBox using renderer has bad font color

[KIRIYAMA Takuya]

Hi all,
This pull request is the backport of JDK-7093691.
It is clean, but the added test DisabledComboBoxFontTestAuto.java fails with some LAFs. This problem is resolved in JDK-8310072.
I will create the pull request which backports JDK-8310072.

Testing:
javax/swing/JComboBox and tests using DefaultListCellRenderer class on Windows and Linux

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Commit messages:
 - 7093691: Nimbus LAF: disabled JComboBox using renderer has bad font color
 - 7093691: Nimbus LAF: disabled JComboBox using renderer has bad font color
 - 7093691: Nimbus LAF: disabled JComboBox using renderer has bad font color

Changes: https://git.openjdk.org/jdk17u-dev/pull/3008/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3008&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-7093691
  Stats: 238 lines in 3 files changed: 229 ins; 6 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3008.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3008/head:pull/3008

PR: https://git.openjdk.org/jdk17u-dev/pull/3008