If you have a QML file that has an error, these errors are not shawn in the "Run" toolview, and the app keeps run (which is true) without any notice of an error.

Example QML file:

############################
import QtQuick 2.7

Item
{
    width: "Hi!"
    appProp: 240
}
############################

If you run the app from terminal, it complains about appProp first, fixing it will lead to the width error then.


[safa@archlinux src]$ ./testApp
QQmlApplicationEngine failed to load component
qrc:/qml/main.qml:6 Cannot assign to non-existent property "appProp"

*Fix in KDevleop*

[safa@archlinux src]$ ./testApp
QQmlApplicationEngine failed to load component
qrc:/qml/main.qml:5 Invalid property assignment: number expected