Two QPainters on same QWindow causes crash

By mistake I have created two QPainters on the same QWindow, causing a crash.

The crash occurs when using the second QPainter to call QPainter::setBrush which calls QRasterPaintEngine::brushChanged, where in the following line :

QRasterPaintEngineState *s = state();

the pointer s is returned as zero (0), resulting in a crash when it is used.

I have corrected my mistake and now use only one QPainter and my program works correctly.

I have not found it mentioned in the documentation that two QPainters are not allowed, so I'm wondering if this is a bug, or a feature that needs to be documented. In the later case, a more graceful error might also be useful.