[jdk8u-dev] RFR: 8212678: Windows IME related patch

[Andrew John Hughes]

On Tue, 21 Oct 2025 09:15:32 GMT, Takuya Kiriyama <tkiriyama at openjdk.org> wrote:

> 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.

I see there isn't a x86_32 Windows build on this PR. It would be best to merge latest 8u-dev and make sure that builds before pushing, but we can also check it on the follow-up PR.

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PR Comment: https://git.openjdk.org/jdk8u-dev/pull/706#issuecomment-3575769057