Change alternative size button behaviour of Workspaces applet

[humdinger]

This is hrev34203.

Keeping the monitor's aspect ratio by holding SHIFT while resizing is great. Getting back to that aspect ratio by clicking the alternative size button in the tab could need a bit of improvement, IMO.

I don't really like that it also moves the applet to the bottom right corner. It's a size widget and the placement shouldn't be pushed on the user.

If clicking the size button would takes the current hight of the applet window it could just stretch its width according to the monitor aspect.
That way, the users can adjust the hight to their liking and with a click get the right proportion.

[leavengood]

This seems reasonable to me. BTW you may know now but that button is generally called the zoom button (well it is to me, since it calls the Zoom() method of the BWindow.)

[pulkomandy]

Fixed in hrev48448.