[Development] QProperty and library coding guide

[Friedemann Kleint]

Hi,

 > 3) how QProperty is source-compatible with Qt 5 user code.

Specifically, it needs to be transparently visible in QMetaObject like old-style properties and setting/retrieving properties via  name and QVariant needs to work for Qt Designer's property editor. Code generation via uic also needs to work transparently.

Regards, Friedemann