Canvas of Graphical Modeler does not resize

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The canvas of the Graphical Modeler does not resize in Windows 7 64 bits. If one of the "actions" goes outside of the visible canvas it becomes unreachable.

The "resize canvas button" does not work and the scroll bars also do not extend the canvas.

I attach an example of a model in which some of the actions became "unreachable" due to this problem.