Library: lots of runtime warnings in Debug mode

[vedgy]

Simply start and exit YACReaderLibrary built in Debug mode in Qt Creator and examine the Application Output tab to reproduce.

Some of the warnings repeat many times on different lines. I pasted only unique errors below:

QLayout::addChildLayout: layout "" already has a parent 
qrc:/qml/FlowView.qml:35: ReferenceError: backgroundImage is not defined 
qrc:/qml/FlowView.qml:86: ReferenceError: comicsList is not defined 
qrc:/qml/ComicInfoView.qml:54: ReferenceError: comicInfo is not defined 
qrc:/qml/ComicInfoView.qml:145: ReferenceError: comic is not defined 
QObject::connect: No such signal LibraryCreator::failedUpdatingDB(QString) in ../../yacreader/YACReaderLibrary/library_window.cpp:999 
QSqlDatabasePrivate::removeDatabase: connection '/home/igor/Constant/comics/.yacreaderlibrary/library.ydb7fffedf38d40' is still in use, all queries will cease to work. 
QSqlDatabasePrivate::removeDatabase: connection '/home/igor/Constant/comics/.yacreaderlibrary7fffedf38d40' is still in use, all queries will cease to work. 
QSqlDatabasePrivate::addDatabase: duplicate connection name '/home/igor/Constant/comics/.yacreaderlibrary7fffedf38d40', old connection removed. 
qrc:/qml/FlowView.qml:76:5: QML ListView: Binding loop detected for property "model"

[selmf]

I finally had the time to take a deeper look at this and I have identified two root causes.

• A design error in our database code
• Uninitialized qml context properties when loading the qml sources

We used to have a bug in the server code which ate all regular debug messages via a global message handler, which I suspect is responsible for masking those errors when @luisangelsm wrote the code.

I am working on fixing the database stuff, but it won't be pretty.

For the qml code, I am not sure what to do. The offical solution is to define the references before loading the source, but that isn't how @luisangelsm designed those views. I currently see no easy fix, but I'll keep digging.