[Development] "Add tests for detach on setDevicePixelRatio()" commits in qtbase

[Stephen Kelly]

Something 'funny' is going on with

 https://codereview.qt-project.org/#/c/106855/

See qtbase commits

 * 0b6bfe8c448179ccf9272a309d6b9ddbdc055960
 * d9437af198726e80d68ae4d95108cb08602d07f9
 * 22b5e178e5a32988f8c23170288ef3d48df5f00d
 * 558c9cadddacea37669c28ec2abe62c8f5726e8e
 * 6dcbaa487d222440c2aeeb5f0ad3bc6337d52f5d
 * 23330d498d8b9b247fede83351a9843094540743
 * 57c399c3e65d1339cf3c273adf840801686fb4da
 * 0b440e1498699d0fa37114453dce3f463f0752fb
 * b0c58c2bb4cde616302f98e4c64549ae2ae028cf

at least, all of which are empty, and

 72854081b2e3831ab6619a9c2e7f4ba0a6a1d316

which is not empty. The gerrit commit is 'staged' again even now.

What's going on? Is anything being done about this already? It's
making a messy history and it should be stopped.

Thanks,

Steve.