Gnats 4239

Open AggSeriesSlot / MultiCol with different end dates: Paste can truncate series.

See the three screenshots for some of the steps:

(1) Open the bug model: bug4239.mdl.gz

(2) Open the AggSeriesSlot on the DataObject

(3) SELECT the first three rows

See image 1 ...

(4) Edit >> Copy

(5) SELECT three rows starting with the "444" row. (This
selection extends beyond the data in the first column).

See image 2 ...

(6) Edit >> Paste

... NOTICE that the data below the pasted rows in the 2nd
and 3rd columns is gone. That's bad.

... See image 3.