inline (arrow) function syntax causes incorrect indentation after return key pressed

With this syntax, I the cursor is at the end of the `delegate.row;` and then return is pressed, the line that is inserted is indented too much.

The alternative function(event) syntax below puts the correct indent.

            Keys.onPressed: (event) => {
                let row = delegate.row;
                                [cursor]

            Keys.onPressed: function(event) {
                let row = delegate.row
                [cursor]

This is reproduced with Qt Creator 12.0.2.