When you collapse a node it should probably redraw the tree to take advantage of the new space made available. Also, if the 'collapse' tool is going to leave the trailing branch visible, it should redraw the branch and node at the same level as the leafs (unless branch length is turned on).
When you collapse a node it should probably redraw the tree to take advantage of the new space made available. Also, if the 'collapse' tool is going to leave the trailing branch visible, it should redraw the branch and node at the same level as the leafs (unless branch length is turned on).