[Bug 25288] New: Should change the definition of InputEvent.isComposing

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25288

            Bug ID: 25288
           Summary: Should change the definition of InputEvent.isComposing
           Product: WebAppsWG
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM3 Events
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]
            Blocks: 25287

Currently, InputEvent.isComposing is defined as:

"true if the input event occurs as part of a composition session, i.e., after a
compositionstart event and before the corresponding compositionend event."

However, this behavior isn't useful at committing composition.

E.g.,

keydown: key="a", isComposing=false
compositionstart: data=something
compositionupdate: data="あ"
beforeinput: data="あ", isComposing=true
// DOM change
input: data="あ", isComposing=true
keyup: key="a", isComposing=true
keydown: key="Enter", isComposing=true
beforeinput: data="あ", isComposing=true
// DOM change
input: data="あ", isComposing=true
compositionend: data="あ"
keyup: key="Enter", isComposing=false

Web apps must want to handle the last "input" event is as not a part of
composition because the composition string is committed.

So, I think that InputEvent.isComposing should be defined as:

"true if the input event occurs as part of a composition session, i.e., after a
compositionstart event and before the corresponding compositionend event.
Additionally, there is uncommitted composition string."

I think that this definition isn't useful for KeyboardEvent.isComposing because
some Chinese IMEs don't expose composition string to applications until it's
committed. So, KeyboardEvent.isComposing should just refer compositionstart and
compositionend.

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