[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
---------------------------+-----------------------------
 Reporter:  afercia        |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  I18N           |    Version:  4.9
 Severity:  normal         |   Keywords:
  Focuses:  accessibility  |
---------------------------+-----------------------------
 In some languages, for example Chinese, Japanese, and Korean, Input Method
 Editor (IME) converters are used to show a list of suggestions and pick up
 an alternate script, for example
 [https://en.wikipedia.org/wiki/Japanese_input_methods theJapanese kanji].

 In #42234 / [41988] the `keyup` event used to insert a Tag was changed to
 `keypress` to support IME converters. However, this change broke the
 previous keyboard interaction for users who don't use an IME. See also
 #42233.

 There are now 2 keypress events on the same input but more importantly
 there's now the need to press the Enter key twice to add a term.
 Previously, one Enter key press was enough because the term was added
 ''when releasing'' the Enter key (on keyup).

 The different keyboard interaction behavior can be easily verified testing
 the previous behavior on WordPress 4.8 and the new one on WordPress 4.9.
 Worth noting this also affects the way the associated `speak()` audible
 messages work.

 Thanks to @miyauchi who pointed it out and thanks to the remarkable
 collaboration on this Gutenberg Pull Request
 https://github.com/WordPress/gutenberg/pull/11908 it appears there's now a
 better method to balance the two different needs.

 By using `event.isComposing` it's possible to detect when characters are
 being composed and wait for the composition to end before triggering a
 callback. This way, it should be possible to restore the previous behavior
 for non-IME users (just one Enter key press to add a tag) and also support
 IME users.

 Also, this would align with what Gutenberg already does.

 A couple references:

 Browsers support: https://developer.mozilla.org/en-
 US/docs/Web/API/KeyboardEvent/isComposing#Browser_compatibility

 More details: https://www.w3.org/TR/uievents/#events-composition-types

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/45371>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform