annoying focus click required when shifting between inventory and game

(on Safari at least).

To operate in the inventory after playing in the game window, an extra click (with no visual feedback) is required.

To operate in the game window after operating the in the inventory an extra click somewhere in the game window is (ONLY SOMETIMES) required.

This is annoying and leads to over clicking sometimes.

Also before dragging things around in the inventory, I must hold on an item for a moment. I would expect I can begin a drag immediately.

-Alex