Clarified the backspace key workaround: This is not a Mac OS X issue (as the comment used to imply) but rather an issue in some game engines.

svn-id: r43880

backends/events/default/default-events.cpp

@@ -163,9 +163,13 @@ bool DefaultEventManager::pollEvent(Common::Event &event) {
 			}
 #endif
 			else if (event.kbd.keycode == Common::KEYCODE_BACKSPACE) {
-				// WORKAROUND: On Mac OS X, the ascii value for backspace
-				// has to be set to the backspace keycode in order to work
-				// properly.
+				// WORKAROUND: Some engines incorrectly attempt to use the
+				// ascii value instead of the keycode to detect the backspace
+				// key (a non-portable behavior). This fails at least on
+				// Mac OS X, possibly also on other systems.
+				// As a workaround, we force the ascii value for backspace
+				// key pressed. A better fix would be for engines to stop
+				// making invalid assumptions about ascii values.
 				event.kbd.ascii = Common::KEYCODE_BACKSPACE;
 			}
 			break;