Steps to reproduce:

1. SVG_GRAPH_MAX_NUMBER_OF_METRICS changed to 20
2. Create 1000 items with name "X item", where X is number from 0 to 1000
3. Create graph widget
4. Add host and created items

Result:
On graph displayed items with number 0, 1, 10, from 100 to 109, 11, from 110 to 115
Expected: Items are prioritized by item name. So items with number from 0 to 20

If items name are "item[X]" where X number from 0 to 100, on graph displayed items with number: 0, from 100 to 118, and 10