D18299: ComboBox: fix default delegate

[Aleix Pol Gonzalez]

apol added inline comments.

INLINE COMMENTS

> broulik wrote in ComboBox.qml:58
> Are you sure this is needed? Qt docs say for that using `ItemDelegate` for a `ComboBox` is recommended as:
> "This ensures that the interaction works as expected, and the popup will automatically close when appropriate. "
> The `currentIndex` change makes sense, though

otherwise it didn't work. I may have overlooked something though.

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

REVISION DETAIL
  https://phabricator.kde.org/D18299

To: apol, #frameworks, davidedmundson
Cc: broulik, plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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