FlattenRunArray
static void* FlattenRunArray(const text_run_array* runArray,
void *flattenedRunArray = BTextView::FlattenRunArray(array, &_size);
void* data = BTextView::FlattenRunArray(textRuns, &dataSize);
void* flattened = FlattenRunArray(runArray, &runSize);
void* data = BTextView::FlattenRunArray(textRuns, &tmpSize);
BTextView::FlattenRunArray(runArray, &flatRunArrayLength);
void *flattenedRunArray = BTextView::FlattenRunArray(runArray, &runArraySize);