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win32: Don't multiply the scroll event deltas by the Windows scroll lines setting. See #1408

Christoph Reiter requested to merge creiter/gtk:win32-remove-scroll-multiplier into gtk-3-24

GTK widgets expect the scroll deltas to be 1 or -1 and calculate a scroll value from that. Multiplying the delta by the Windows scroll line setting (which defaults to 3) results in a much larger delta and vastly different behaviour for running a GTK app on Windows vs on Linux. For example text view and tree view scroll by 9 lines per scroll wheel tick per default this way while on Linux it is around 3.

Remove the multiplication for now.

Edited by Christoph Reiter

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