QColorDialog crash on macOS 11 and 12 with failed assertion

Our application started experiencing crashes in QColorDialog::getColor after switching from Qt 5.15 to Qt 6.2.

The crash shows an assertion failure in macOS code: "Assertion failed: (backingScaleFactor > 0.f), function drawnFocusRingBitmapForTime, file NSAutomaticFocusRing.m, line 346."

Initially I wrote this off as a macOS bug, because partially it is. But further testing showed that it was not present in Qt 5.15.

I'm attaching a very basic sample application that can reproduce the issue, as well as a crash dump file.

Steps to reproduce:

1. Be running macOS 11 or 12
2. Build the sample application against Qt 6.2 or newer
3. Press the 'Color' button to open the color dialog.
4. If the saved swatch area has any saved samples, delete those, quit the application, and relaunch it.
5. Adjust a color.
6. Drag the color swatch (on the bottom left) into one of the saved sample areas.
7. The program abruptly terminates.

The issue was introduced with this change:

https://code.qt.io/cgit/qt/qtbase.git/commit/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm?id=6430d1db636962ed25dd1c14a2d7ae548bafb948

Reverting that change fixes the issue.