If you go to highlight the text in the search by clicking to the right of the text and dragging the mouse to the left it will properly highlight until you hit the edge of the streamus window at which point it will lose all highlight. If you keep dragging, roughly offset the width of the streamus window, it will start highlighting again and will match the mouse movements as if the cursor was above the text. It seems to act as if the window is offset to the left of where it actually is.
If you go to highlight the text in the search by clicking to the right of the text and dragging the mouse to the left it will properly highlight until you hit the edge of the streamus window at which point it will lose all highlight. If you keep dragging, roughly offset the width of the streamus window, it will start highlighting again and will match the mouse movements as if the cursor was above the text. It seems to act as if the window is offset to the left of where it actually is.
Demonstration: https://www.youtube.com/watch?v=_94_1YUQqJ4