I was hoping that it would be possible to get the Qt Creator QML debugger to
attach to an already running process like the unity-2d-spread process, in a
similar way to gdb attaching to a process. It turns out that there isn't an
option to do that. So my current plan is to attempt to hack the Qt Creator
code to add that feature. My worry is that, even after doing that, I still
wouldn't find out what was causing bug #753269. But I can't think of a better
plan of attack - does anyone have any suggestions?