[Coin-discuss] no zoom in QuarterWidget using Mouse Wheel

[Anatoli Barski]

I'm wondering if the zoom feature of QuarterWidget is not implemented
for mouse wheel or if you have to enable the QWidget to grab them.
Though mouse click&drag events are being processed properly.

setNavigationModeFile is also mysterious, because there is no
documentation which arguments you can pass to the function 
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