w3m-shift-right smarter than w3m-shift-left

[jidanni@xxxxxxxxxxx]

Regarding
.	Shift to the left.
,	Shift to the right.
one notices that if one holds down "." it will keep shifting into
outer space （外太空）, even though e.g., the image went off the
screen many columns ago, and one will need to hold "," down just as
long to get it back.

"," on the other hand is smarter. The image bangs into the side of the
screen and refuses to drift off.