Reply a meaningful dBus error when detecting unmanaged windows (!396) · Merge requests · Plasma / KWin

Currently, the method createErrorReply() with empty strings errors out and the client gets no answer:

QDBusConnection: error: could not send error message to service "": Error name cannot be empty

Simple test:

qdbus org.kde.KWin /KWin org.kde.KWin.showDebugConsole
qdbus org.kde.KWin /KWin org.kde.KWin.queryWindowInfo

Error name uses D-Bus Interface-like notation as suggested in https://doc.qt.io/qt-5/qdbuserror.html#name

Reply a meaningful dBus error when detecting unmanaged windows