fix_members_attr.dendrogram(dend, ...)

# define dendrogram object to play with:
hc <- hclust(dist(USArrests[1:3, ]), "ave")
dend <- as.dendrogram(hc)
# plot(dend)
# prune one leaf
dend[[2]] <- dend[[2]][[1]]
# plot(dend)
dend # but it is NO LONGER true that it has 3 members total!
fix_members_attr.dendrogram(dend) # it now knows it has only 2 members :)

hc <- hclust(dist(USArrests[1:3, ]), "ave")
dend <- as.dendrogram(hc)

identical(prune_leaf(dend, "Alaska"), fix_members_attr.dendrogram(prune_leaf(dend, "Alaska")))
str(unclass(prune_leaf(dend, "Alaska")))
str(unclass(fix_members_attr.dendrogram(prune_leaf(dend, "Alaska"))))