Double click and drag should keep selection from double click and add to it with the drag.

1. Double click and hold over some text. Note that what is under the mouse is highlighted.

2. With the mouse button still 'down', start to drag right to add the next word to the selection.

Expected:

The doubled clicked selection should remain and the next whole word should be added to the selection.

Actual:

The selection will start as if you never double clicked. It will start from where your drag started.