## we left leftcol and rightcol as the left and right columns of any
## content in the current view. but since we're operating in a
## line-centric fashion, rightcol is always leftcol + the buffer
## we left leftcol and rightcol as the left and right columns of any
## content in the current view. but since we're operating in a
## line-centric fashion, rightcol is always leftcol + the buffer