multiselect bug in edit grid on win32

Hi,

I'm running 1.8.1 rev 6948 on Windows 2003 Standard.

If you go to an edit grid, click a row, and then shift-click another 
row, the standard behaviour on Windows (and in Firefox on other 
platforms, etc.) is to select the first row you click and second row you 
click and everything in between them.  In pgAdmin instead it selects the 
first row you click by itself, plus everything from the first row in the 
entire grid through to the second row you clicked, inclusive.

This is by using the row headers to select rows.  A workaround is to 
click the leftmost column of one row and shift-click the rightmost 
column of another row, this works as it should (and as the above case 
should too, I think.)

Thanks,
Kev