A bug with the page not scrolling is fixed in #5919

Add a test to prevent regression

Steps to reproduce the bug before the fix:

1. Add a table with many rows so that it goes beyond the visible window
2. Mouse down on one of the cells close to the bottom of the window
3. Quickly move the mouse beyond the bottom window border

Result: The window is not scrolled
Expected result: The window is scrolled allowing selection of the table