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After introducing the fix for tab navigation through cells, we focus on the selected cell and we need to update the condition to take that into account.
When clicking, tabbing, and moving the active element in the document is the cell. However when we hit escape to exit edit mode the focus is lost and we need the original check
DOM.isAncestor(this.container.nativeElement, document.activeElement)
Also, when moving to another cell we need to focus on the new active cell, so the focus doesn't stay in the previous cell.
This pr is for #19058