Determining mirrored Qt submodules that are not mirroring properly

gistfile1.txt

I encountered an issue with Qt repositories that are mirrored, but not all submodules being mirrored properly.
This makes it impossible to clone and build new Qt releases. These notes help discover which submodule repositories are not syncing properly with the code.qt repositories:

For further testing to verify that all the needed submodules are mirrored properly for a given release tag, I test the following way:

```
$ git clone https://mirror.host/foo/qt5.git -b v6.5.2
$ ./init-repository --force --module-subset=default,-preview,-qtnetworkauth,-qtpurchasing,-qtquick3d,-qtlottie,-qtcharts,-qtdatavis3d,-qtvirtualkeyboard,-qtwebglplugin,-qtactiveqt,-qtconnectivity,-qtcoap,-qtmqtt,-qtopcua,-qtquicktimeline,-qtquickeffectmaker,-qtquick3dphysics
# (failures will occur if the needed submodule refs (commits) are not present in the submodule repositories)
$ for subm in $(git submodule status | awk '/^+/ {print $2}'); do git submodule update $subm; done
# Then, this will show you the submodule repositories that are not mirroring properly:
$ git submodule status | awk '/^+/ {print $2}'
```