runLayoutCallback method
Invokes layoutCallback with invokeLayoutCallback.
This method must be called in performLayout, typically as early as possible before any layout work is done, to avoid re-dirtying any child RenderObjects.
Implementation
@mustCallSuper
void runLayoutCallback() {
assert(debugDoingThisLayout);
invokeLayoutCallback((_) => layoutCallback());
_needsRebuild = false;
}