The issue of the cursor moving to the left of >>> in the 
shell is
separate.  See also #3851.  The current action of the home 
key,
released in 2.6, is from patch 1196903.  @tjreedy, if in 
2.6 you
type >>> syzygy and hit home, the cursor moves to the left 
of the
's'.  A second 'home' moves it to the left margin.  
Subsequent 
presses toggle the cursor between those two position.  
While the
action in the shell could be special cased, I consider 
this to be
cosmetic - and not only that, but moving to the left 
border is
useful when you want to mark a shell region for copy/
paste. So
"won't fix" is my response to that 'complaint'.  Now back 
to the
subject of this patch....