big value are not displayed in the output grid

[Grazvydas Valeika]

I would like to have an opportunity to see that content of query result cell is too long to display.

F.e. situation:
I have query with array_agg function in one column. Most of rows bring up to 20 values, some ~100, only one row brings ~700 integer values, but in pgAdmin result grid this cell is empty and looks exactly like null value.