Adapt to change of formerly private KTextEditor::View signal configChanged
configChanged() was a signal of KTextEditor::ViewPrivate, but that has been changed for upcoming KF 5.79 (February 2021) where it is becoming an official signal in the API of the public KTextEditor::View, but with different signature, see commit series frameworks/ktexteditor@c7603876 frameworks/ktexteditor@a5c270cb frameworks/ktexteditor@5a2390b7
@mwolff This signal change breaks existing kdevelop releases due to the signature change of the signal. So ideally there would be some 5.6.2 release before KF 5.79 gets out begin of February.