WIP: Deprecate KToolBar::iconSizeDefault() officially in public API
--KDE5 TODO
And move logic to new member method of KToolBar::Private
Stalled: actually this method is used in kdenlive -> https://invent.kde.org/multimedia/kdenlive/-/blob/master/src/mainwindow.cpp#L3866 and again two lines below
Need to investigate more first what to do about it.
Edited by Friedrich W. H. Kossebau