Robert Ancell 7436af8647 Only handle smooth scroll events.
On X11 scroll events are being directly sent to the FlView X window. This is
causing them to bypass the normal scroll handling and means this widget received
both smooth and non-smooth scroll events.

I haven't been able to find a solution to the root cause of the problem, so only
smooth scroll event are being processed. This could cause issues on older
versions of the X server that don't send smooth scroll events, but fixes the
problem for the common modern case.

This issue doesn't occur in Wayland.
2021-01-14 09:06:36 +13:00
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