previousSelection returned entire object vs ids

[nickchomey]

Fixes #1688

previousSelection was returning the entire node and edge objects rather than just an array of ids. This fixes it. I only tested it via modifying the vis-network.min.js file directly, but have translated it back to this format. Please check and improve as necessary. - I am brand new to javascript, so assume there are more efficient ways of extracting the ids.

value: function (g, A) {
    var t = !1,
        e = this._selectionAccumulator.commit(),
        C = {},
        nodes = [], 
        edges = [];    
    for (let i = 0; i < e.nodes.previous.length; i++ ){
        nodes.push(e.nodes.previous[i].id);
    };
    for (let i = 0; i < e.edges.previous.length; i++ ){
        edges.push(e.edges.previous[i].id);
    };    
    C = {
        nodes: nodes,
        edges: edges
    };

[micrology]

The following might be neater:

Replace lines 18179 - 18182 in vis-network/esnext/esm/vis-network.js :

const previousSelection = {
      nodes: selectionChanges.nodes.previous,
      edges: selectionChanges.edges.previous,
    };

with

const previousSelection = {
    nodes: selectionChanges.nodes.previous.map(node => node.id),
    edges: selectionChanges.edges.previous.map(edge => edge.id),
  };