Seems like I must allow the grid to calculate pagesize - OK. I have to say that I dont like that. I might have very good reasons for wanting a small pagesize.
I have a dataset with 100 rows so the grid/store/scroller gets it all in one chunk (it asks for rows 0-323)
Most important issue is that the last line doesnt show. This is consistent, I only get 99 rows
Second issue: if I scroll up and then down again (by a few rows) the data gets reread. Is this by design? I dont think so - it happens because my record count (100) is less than the calculated endpoint (323) and so the second call to rangeSatisifed in store.guaranteeRange returns false. These calculations need to take totalCount into consideration