D9275: fix RTL appearance for ComboBox

[Safa Alfulaij]

safaalfulaij added a comment.


  I've done some more testing and read some Qt docs. `Popup` item get reparented to the window once displayed, so LayoutMirroring is applied to it only at that point (applying it to the contentItem).
  So my comments above about `Popup` not inheerting `Item` are wrong, sorry.
  I'm still not sure if this is needed really.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D9275

To: mvourlakos, #plasma, mart
Cc: safaalfulaij, mart, plasma-devel, #frameworks, michaelh, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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