[wp-trac] [WordPress Trac] #45371: Add tag: Use `event.isComposing` to support input method editor (IME) converters

[WordPress Trac]

#45371: Add tag: Use `event.isComposing` to support input method editor (IME)
converters
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 Reporter:  afercia                  |       Owner:  ryanshoover
     Type:  defect (bug)             |      Status:  assigned
 Priority:  normal                   |   Milestone:  5.2
Component:  I18N                     |     Version:  4.9
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:  accessibility
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Comment (by ryanshoover):

 @afercia It's an old trick I was taught to help catch undefined values.
 Some browsers will throw an error if you just check `if ( window.tagBox )
 {}` but will correctly evaluate to false on `if ( window.tagBox || false )
 {}`.

 I don't have the rationale at hand. Let me try to track it down.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45371#comment:31>
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