[Interest] Qt 6.5.2 and qmllint questions/issues

[Matthew Fincham]

Hi

We are in the process of integrating qmllint after migrating a project 
to Qt6, and have hit a few issues.

-- QtLocation --
The linter is unable to resolve types in QtLocation. Adding the 
following dependencies to qml/QtLocation/qmldir resolved the problem:

    depends QtQuick
    depends QtPositioning

 From what I can see those dependencies should be there, but I am on the 
learning curve. If they should be, should a bug report be created?


-- Enums in gadgets --
The linter is unable to resolve enums defined in gadgets (Type not found 
in namespace [unresolved-type]). The class definition looks like this:

    struct MyType
    {
         Q_GADGET
         QML_ELEMENT

       public:
         enum class MyEnum
         {
            OptionA,
            OptionB,
            OptionC,
         };
         Q_ENUM(MyEnum)

         ...

    };

Example enum reference in qml is:

    MyType.MyEnum.OptionA


The runtime reference works. Following the instructions here 
https://doc.qt.io/qt-6/qtqml-cppintegration-overview.html, even with the 
QML_UNCREATABLE macro, the type could still not be resolved. Looking at 
the qmltypes file, if the 'accessSemantics' for the type is changed to 
'reference' from 'value' the linter works. Is this a problem with 
linter, or possibly with the macro annotations of the type?

-- 'as' operator --
The 'as' operator has been used to deal with the 'missing-property' 
warning in this type of pattern in QML

    Loader {
       id: loader
       sourceComponent: Dialog { ... }
    }

    ... {
       (loader.item as Dialog).open()
    }


This silences the linter, but at runtime there is an error, in this case 
when the 'open()' function is called: 'TypeError: true is not a function'.
What is the status of the 'as' operator? It doesn't appear to be 
documented. Can it be used, or does it have known short-comings?

Please also note the type registration is done manually, not with the 
code generated by qmltyperegistrar. Any pointers would be appreciated.

Many thanks
Matthew Fincham
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