Reproduce

1. Open the pages app and navigate to the flat view (the important thing is that there has to be more items than it's the grid's view size)
2. Try to filter using the title column

Actual
As soon as results are returned the input field loses its focus. I was only able to type about 4 characters before it lost focus and filtered the column.
Trying to clear the field also causes the field to lose focus when all the data is shown again.

Expected
It is possible to continue typing into the filter input field without an additional use of the mouse and also when Magnolia displays found data