[Webkit-unassigned] [Bug 240562] New: Mouse events triggered out of order when editing with japanese keyboard

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240562

            Bug ID: 240562
           Summary: Mouse events triggered out of order when editing with
                    japanese keyboard
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chandraprakash.siva at outlook.com

Created attachment 459528

  --> https://bugs.webkit.org/attachment.cgi?id=459528&action=review

Events triggered out of order

Mouse down and mouse up events are triggered out of order sometimes when clicking on an input field (or contenteditable div) with the japanese keyboard selected.

The expected order should be 
1.mousedown
2.mouseup

The actual order is 
1.mouseup
2.mousedown


Reproducible steps:
1.Switch input method to japanese (Hiragina)
2.Type some text, click on the input area repeatedly.

Created a fiddle to test this (modified version of https://dvcs.w3.org/hg/d4e/raw-file/tip/mouse-event-test.html)
https://jsfiddle.net/4dzepn1x/

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