Nested Viewport confusion - feature request

Viewport B is nested in Viewport A.
B doesn’t have a vertical scrollbar visible but it has an horizontal scrollbar visible.

I would expect that scrolling vertically through B would actually scroll A and leave B idle. But what happens is that B will scroll horizontally until the view gets totally to the right, then proceed to scroll A.

Looking at the code it seems there is no easy way to work around this. I would really appreciate to have an option in the Viewport to deal with that. This option could be to only allow scrolling from the Scrollbar, disabling the mouseWheel, or it could be to prevent the horizontal scrolling when mouse scrolling vertically.

Thank you.

I need this as well. Please add an option to disable vertical scroll wheel scrolling horizontally.

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