@Pollyanna: So, I'm starting from an edit page on SO. Say,
stackoverflow.com/posts/4801456/edit. Place the mouse pointer just after the word "class". Press the mouse button down. Drag the mouse up, and to the left. While the pointer is still in the textbox, observe that the text is selected appropriately (extends to follow the pointer). Now, exit the textbox
to the left (not above).