Quentin,

          Thanks much for that information.  One of the few instances
where I've seen a need to use drag and drop via the keyboard is
rearranging the displayed column order in Thunderbird.  Because I've
had so much trouble with this in the past, because I didn't know that
a bump of the mouse was required, I've suggested that folks find a
sighted assistant since this is generally a one-off activity.  At
least now I know why I've had the difficulties I've had as I'd
certainly not have expected the need for actual mouse use (or the
equivalent via Golden Cursor), that's for sure.

--
Brian- Windows 10 Home, 64-Bit, Version 1709, Build 16299  (dot level
on request - it changes too often to keep in signature)

*//**/The opposite of a correct statement is a false statement./**/But
the opposite of a profound truth may well be another/**/ profound truth./*

*/~ /**/Niels Bohr/*