Line information potentially wrong for dynamic slots in .qml files

dynamic slots defined in .qml can end up having the wrong line information attached in Qt. E.g. for

1: function f()
2:
3: {
4:   i += 1;
5: }

the JavaScript engine will report that the 'i+=1' line is in line 2, since any line breaks before the opening bracket are silently discarded in the parser.