Zoom + - shortcuts should follow the mousecursor position

When the score is zoomed using the mousewheel, the zoom follows the mousecursor position.

When zoom is called by keyboard shortcuts, the zoom does NOT follow the mousecursor position. It would be better if it did.

The mousewheel control does not work on Mac when working remotely by screen sharing, the keyboard shortcuts must be used, and this results in having to drag the score around every time zoom is used, which is inconvenient.