D16106: Focus handling fixes

[Eike Hein]

hein added inline comments.

INLINE COMMENTS

> davidedmundson wrote in main.qml:425
> I would have expected just folderViewLayer.forceActiveFocus() to work?
> 
> the FolderViewLayer item should be the only item within the Loader (which is a focus scope) and you added focus: true to FolderViewLayer

Maybe, but if you look at the diff, what this is replacing is indiscriminately doing `root.forceActiveFocus()`, which isn't good enough. root is the FolderViewDropArea, which is not a FocusScope and can't be.

... however, I added the focus-forwarding (root.onFocusChanged) in a later change - which means I can now actually clean this up again.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.14

REVISION DETAIL
  https://phabricator.kde.org/D16106

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