SUMMARY

A default value helper for a kcfg entry of a "Url" type that has a default value pointing to "qrc:/" Qt resource (which itself is a valid Url) will return a QUrl object initialized improperly with a malformed "file:qrc:/" value. 

This is due to the fact that the helper uses QUrl::fromUserInput() to parse the provided value, which in turn does not handle the "qrc:/" Urls, and Qt refuses to make it to. Relevant discussion about fromLocalFile() that behaves identically here: 
https://bugreports.qt.io/browse/QTBUG-44165

The proposed solution is to make the helper detect the qrc:/ substring and initialize QUrl object directly: 

    if (urlString.startsWith(QStringLiteral("qrc:/"))) {
      return QUrl(urlString));
    }
    else {
      return QUrl::fromUserInput(urlString)


STEPS TO REPRODUCE
1. Add a kcfg entry:
    <entry name="SomeConfigSwitch" type="Url">
      <default>qrc:/someConfigValue</default>
    </entry>
2. Add "DefaultValueGetters=true" to .kcfgc file
3. auto defaultConfigUrlValue = PluginSettings::defaultSomeConfigSwitchValue().url()

OBSERVED RESULT
Notice that defaultConfigUrlValue is "file:qrc:/someConfigValue"


EXPECTED RESULT
defaultConfigUrlValue should be "qrc:/someConfigValue"

SOFTWARE/OS VERSIONS
Linux: Ubuntu 20.04.1 LTS
KDE Frameworks Version: 5.68
Qt Version: 5.12