[Qt-creator] add one more to that previous email

[Nathan Carter]

On the Mac, we expect all our editors, when we triple-click, to  
highlight the entire line/paragraph and thenceforth be in line/ 
paragraph-selection mode.  This is not the behavior I observe in Qt  
Creator, and I keep running into it because I have (from all my other  
UI experiences) the habit of triple-click-and-drag to select a big  
block of lines.

Nathan