Describe the bug
If we try to manually enter a value in the 'Start' input of the DateRangePicker, the entered value is applied to its 'End' input.

To Reproduce

1. Open this StackBlitz example
2. In the "Start" input select the field that holds the '5' digit. Now we can edit the day of the month for the Start date
3. Enter 8 with the keyboard

Expected behavior
The value of the "Start" input should be updated to 9/8/2018. Instead, the value of the "End" input is being changed to "9/8/2018" and the "Start" day continues to be "9/5/2018".

Screenshots