I have enabled middle button click to zoom in or (with Shift) out. This is in addition to middle button drag which pans the canvas as before. This works in all tools.
The zoom increment (used by all zoom methods) is now stored in the preferences [options.zoomincrement].
I also changed the algorithm of zooming in/out on click. Previously, the point you clicked on was centered in the window after zoom. Now it remains under your mouse, i.e. you can position mouse over the object you're interested in and click several times in a row to zoom into it without having to move your mouse, even if that object is not in the center of window. I think it's much more convenient this way.
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