How does resizing nodes work?

[ghost]

How does it choose which two nodes to resize when using super + right mouse drag?

[ortango]

using the window that the cursor is above:

• gets the "handle": the corner or side that the cursor is closest to, depending on if resize corner or side is the action.
• it uses the handle to determine the node(s) to resize using find_fence().
• find_fence returns a inner node whose split_ratio resize_client() adjusts as you grab and drag