Srolling the menu window generates a selection

Created by: FrancescoMondada

On MACOSX (10.8.5) and Blocly included in Studio 1.5.3, there is a problem of selection of the items in the menus of commands. To be reproduced: start studio, activate blockly, click on one of the menus of orders (for instance "actioneurs", point on one of the item (the item is activated) and scroll (using the trackpad). The item is selected and placed. The scroll functionality has also strage behaviors on the main window...