RFR: 8322703: Intermittent crash in WebView in a JFXPanel from IME calls on macOS [v2]

[Kevin Rushforth]

On Tue, 16 Jan 2024 13:54:00 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> As noted in the JBS bug, this is a follow-on to [JDK-8196011](https://bugs.openjdk.org/browse/JDK-8196011) that I discovered while testing the fix for [JDK-8221261](https://bugs.openjdk.org/browse/JDK-8221261) (a deadlock in the IME code when using WebView in a JFXPanel on macOS).
>> 
>> I have tested this in connection with with the proposed fix for JDK-8221261, although it is a valid fix regardless.
>> 
>> This expands the fix done in [JDK-8221261](https://bugs.openjdk.org/browse/JDK-8221261) to call all of the WebKit methods on the right thread. Additionally, we sometimes see spurious exceptions where the committed text is coming back as null, so I changed the log level to "fine" rather than "severe" for those exceptions. I'll file a follow-up bug  to see if any of these are real problems or not.
>
> Kevin Rushforth has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - Merge remote-tracking branch 'upstream/master' into 8322703-webkit-ime-crash
>  - 8322703: Intermittent crash in WebView in a JFXPanel from IME calls on macOS

> Additionally, we sometimes see spurious exceptions where the committed text is coming back as null, so I changed the log level to "fine" rather than "severe" for those exceptions. I'll file a follow-up bug to see if any of these are real problems or not.

I decided to revert this change to the log level so as not to hide exceptions that might occur. They don't happen often, and we should report them when they do.

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PR Comment: https://git.openjdk.org/jfx/pull/1321#issuecomment-1895753776