Class K4Style

and allows to style KDE specific widgets.

Member K4Style::CheckBox::FocusMargin

have a look, it isn't as nice as plastique etc.

Member K4Style::Menu::Margin

have a look at comments at PM_MenuHMargin...

Class K4Style::ProgressBar

support for Qt > 4.1 orientation, bottomToTop, invertedAppearance properties!

Member K4Style::TabBar::BaseHeight

is this used for things like I intended TabWidget::ContentsMargin for?

Member K4Style::TabBar::IndicatorTear

K4Style default implementation...?

Member K4Style::TabBar::NorthTab

say something about triangular shape etc.

Member K4Style::ToolButton::Primitive

Implement CE_ToolButtonLabel to have own Generic::Text, Generic::Icon, and LayoutProps PressedShiftHorizontal, PressedShiftVertical, TextToIconSpace, MenuIndicatorSize...

Class K4Style::Window

SP_TitleBar* pixmaps

Member K4Style::Window::ButtonRestore

split min/max restore?

Member KLocale::formatByteSize (double size) const

KDE 5: Remove in favor of overload added in KDE 4.4.

Member KNetwork::KSocketDeviceFactory< Impl >::create (KSocketBase *parent) const override

Who owns the parent afterwards?