Returns the minimum baseline value among every child.
Useful when the vertical position of the children isn't determined by the order in the child list.
Source
double defaultComputeDistanceToHighestActualBaseline(TextBaseline baseline) {
assert(!needsLayout);
double result;
ChildType child = firstChild;
while (child != null) {
final ParentDataType childParentData = child.parentData;
double candidate = child.getDistanceToActualBaseline(baseline);
if (candidate != null) {
candidate += childParentData.offset.dy;
if (result != null)
result = math.min(result, candidate);
else
result = candidate;
}
child = childParentData.nextSibling;
}
return result;
}