Function get_visible_paths 

pub fn get_visible_paths<T>(
    nodes: &[TreeNode<T>],
    state: &TreeViewState,
) -> Vec<Vec<usize>>

Gets all visible paths (flattened tree with expansion state).

Returns paths for all nodes that are currently visible, respecting the expansion state of parent nodes.

Arguments

• nodes - The tree nodes
• state - The tree view state (for expansion info)

Returns

A vector of paths (each path is a Vec<usize>) for all visible nodes.