8212678: Windows IME related patch

[tkiriyama]

Hi All,

I would like to backport this bug fix (JDK-8212768) done in jdk13 to jdk8. It is basically a clean backport, but only the copyright of awt_InputMethod.cpp and awt_Component.cpp is not updated because the current source is newer.

The following fixes are resolved.

Issue A: Cannot display surrogate pair character on Windows floating IME window for passive component
It has been reproduced using the test program (SwingSet2) in a specific environment and verified that this fix resolves it.

Issue B: Control Windows IME status using InputSubset and UnicodeBlock for CJK countries
It has been reproduced using the test program (ImSubsetsTest.java) in a specific environment and verified that this fix resolves it.

Issue C: Check pre-edit string availability for Windows Chinese IME
It probably won't happen again in the new environment. I have verified that the behavior of the test program (IMFTestA.java) remains unchanged after this fix.

JTREG tests were executed using the -a option (automatic tests only) for the test suites java/awt/Component and java/awt/InputMethods. No failures were found.

The changes implemented in JDK-8212678 alone are not sufficient to fully resolve IME-related issues. To ensure a complete fix, the changes from JDK-8258805 must also be integrated.
I plan to create a separate pull request.

Thank you.

---

Progress

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Issue

• JDK-8212678: Windows IME related patch (Bug - P3)

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[bridgekeeper]

👋 Welcome back tkiriyama! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

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• 00: Full (ccb20c8f)

[openjdk]

This backport pull request has now been updated with issue from the original commit.