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Internals
=========
=== algo to handle threaded graph layouting correctly ===
###### GENERAL ALGO
_layouting_start(graph-2, coords-2);
_add/del(structs-3);
_repositionning(graph, structs, coords);
_layouting_end(coords-2);
_v2_updtate(structs-2, graph-2, coords-2);
_v2_structs/graph_update(structs-2, graph);
-> structs, graph // real add/del
_coords_copy(coords-2);
-> coords
_repositionning(graph, structs, coords);
_v3_update(structs-3);
_v3_structs/graph_update(structs-3, graph-2);
-> structs-2, graph-2
###### TIMELINE VERTICE ADD
egraph_vertice_add();
id = freeids[vertices_count];
v = vertices[id];
v->id = id;
vertices_count++;
v->v3-new = 1;
_v3_update();
v->v2-new = v->v3-new;
v->v3-new = 0;
_v2_add()
v->graph2_vid = graph2_vcount;
graph2_vcount++;
igraph_add_vertices(graph2);
_layouting_start();
// end up in coords2
_layouting_end();
_coords_copy();
// end up in coords
_v2_update();
_add()
v->v2-new = 0;
v->graph_vid = graph_vcount;
graph_vcount++;
igraph_add_vertices(graph);
evas_object
// in structs, graph, coords
###### TIMELINE VERTICE DEL
egraph_vertice_del();
v->v3-del = 1;
_v3_update();
v->v2-del = v->v3-del;
v->v3-del = 0;
_v2_del()
igraph_delete_vertices(v->graph2_vid);
graph2_vcount--;
_layouting_start();
// not in coords2
_layouting_end();
_coords_copy();
// not in coords
_v2_update();
_del();
igraph_delete_vertices(v->graph_vid);
graph_vcount--;
freeids[vertices_count] = v->id;
vertices_count--;
free(v);
// removed from structs, graph, coords
###### TIMELINE VERTICE DEL
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