Fix crash in SceneSplitTask
taskDone() was called too early, resulting in the task getting deleted while the markers were still being processed (segfault). A "QMutex: destroying locked mutex" error was seen as a symptom.
Reported in #1563
taskDone() was called too early, resulting in the task getting deleted while the markers were still being processed (segfault). A "QMutex: destroying locked mutex" error was seen as a symptom.
Reported in #1563