merge static method
Creates a BorderDirectional that represents the addition of the two given BorderDirectionals.
It is only valid to call this if BorderSide.canMerge returns true for the pairwise combination of each side on both BorderDirectionals.
Implementation
static BorderDirectional merge(BorderDirectional a, BorderDirectional b) {
assert(BorderSide.canMerge(a.top, b.top));
assert(BorderSide.canMerge(a.start, b.start));
assert(BorderSide.canMerge(a.end, b.end));
assert(BorderSide.canMerge(a.bottom, b.bottom));
return BorderDirectional(
top: BorderSide.merge(a.top, b.top),
start: BorderSide.merge(a.start, b.start),
end: BorderSide.merge(a.end, b.end),
bottom: BorderSide.merge(a.bottom, b.bottom),
);
}