[REG 6.2.2 -> 6.2.3] Integer overflow in gui/painting when drawing svg image

1. Have a build of Qt including qtsvg configured with "-sanitize undefined".
2. Use that to build the attached project.

   qt-cmake /tmp/report/ && cmake --build .
   

3. Run the resulting program and pass the input file.

   ./report /tmp/report/50637.svg
   

   You will see output like:

   /home/qtrob/dev/src/qt-dev_09.23-base_imageformats_svg/qtbase/src/gui/painting/qdrawhelper.cpp:5002:59: runtime error: signed integer overflow: -772328716 * 6 cannot be represented in type 'int'
   SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/qtrob/dev/src/qt-dev_09.23-base_imageformats_svg/qtbase/src/gui/painting/qdrawhelper.cpp:5002:59 in
   

Google's oss-fuzz found this as issue 50637. That report is public now because is was closed as false negative. Two days later, it was replaced by the equivalent 52383.