debugAsymmetricPaintCount property
The number of times that either this render object repainted without the parent being painted, or the parent repainted without this object being painted. When a repaint boundary is used at a seam in the render tree where the parent tends to repaint at entirely different times than the child, it can improve performance by reducing the number of paint operations that have to be recorded each frame.
Only valid when asserts are enabled. In release builds, always returns zero.
Can be reset using debugResetMetrics. See debugSymmetricPaintCount for the corresponding count of times where both the parent and the child painted together.
Implementation
int get debugAsymmetricPaintCount => _debugAsymmetricPaintCount;