If a tablechart is attached inside its source element (which can only happen in the case of multiple tables, unless you put the chart in a table cell), then if the chart is redrawn, tables that are associated with the chart (such as the legend) will be accidentally scraped and could break charting. So we filter them out.
If a tablechart is attached inside its source element (which can only happen in the case of multiple tables, unless you put the chart in a table cell), then if the chart is redrawn, tables that are associated with the chart (such as the legend) will be accidentally scraped and could break charting. So we filter them out.

ecenter/jqplot