changing a type of selection

Is there a way to change a selection type from one to the other (say
from visual to visual block mode) without deselecting, choosing the
new type, and then reselecting using a range/movement?

If I accidentally select in visual mode and deselect, then C-v to go
into visual block, the 'gv' command reselects, but in the previous
(block) mode. I'd like something to switch while selected or to make
'gv' keep the new type.

I hope the question makes sense!

c
--
Chris Lott <chris@chrislott.org>

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