Adjust topline if required to insert quoted lines.

exec/fseditor.js

@@ -1223,6 +1223,8 @@ function quote_mode()
 					if(quote_line[i].selected) {
 						line.splice(ypos,0,quote_line[i]);
 						ypos++;
+						if(ypos-topline > lines_on_screen)
+							topline++;
 					}
 				}
 				quote_window_displayed=0;