D7011: Extract KPasswordLineEdit class

[Kevin Funk]

kfunk added inline comments.

INLINE COMMENTS

> cfeck wrote in kpasswordlineedit.cpp:30
> That's fishy. I just checked a single class (KColumnResizer), and it has just "class KColumnResizerPrivate" (no namespace, no QObject), and still has a Q_PRIVATE_SLOT in its KColumnResizer class.

+1. Don't use nested private classes. Nested classes/structs inherit the symbols visibility.

Also see: https://phabricator.kde.org/D6927

PS: In times of Qt5 & lambda-connects, you don't need Q_PRIVATE_SLOT anymore, anyway: 
Just remove the `Q_PRIVATE_SLOT` marker and ...:
`connect(..., this, [this](...) { d->myPrivateSlot(...); });`

REVISION DETAIL
  https://phabricator.kde.org/D7011

To: mlaurent, cfeck, dfaure, elvisangelaccio
Cc: kfunk, kossebau, elvisangelaccio, #frameworks
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