You can hold down CTRL + ALT and press UP and Down to grow your multi-line selection up or down, respectively. But how do you shrink it? Sometimes I'll use this feature to select say, 20 lines but then on accident I press down one extra time and select the 21st line that I did NOT want to select. I can't figure out how to shrink the selection by one line so I have to just unselect everything and start over and try not to select too many lines. So is it possible to shrink the multi-line selection?