[PD] Unnecessary scrollbars since 0.49

[Roman Haefeli]

Hi

It seems there is a slight regression in the logic that decides whether
to show the scrollbars or not. According to my experience, the
behaviour in 0.48 was quite good and now sometimes when opening a
canvas, scrollbars are drawn when none are needed, even for empty
windows. When editing the patch (for instance: by creating an object)
they immediately disappear. 
Another less nice side effect: When the canvas size is chosen so that
objects fit tightly in with only little white space, the scrollbars
cover some objects and justify their existence by appearing at all. To
get rid of them one has to resize the window by first increasing it
enough just to decrease it again.

It does not happen every time with every canvas, but it does happen.

Roman 
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