Graph Editor: Scroll wheel zooms and scrolls property editor

[kwokcb]

A minor nitpick. When the editor has a scroll bar on the right (show all inputs for std surface), if you use the scroll
wheel it will zoom in / out on the preview window but also scroll at the same time so it makes it hard to be able to zoom.

zoom.mp4

Looks like some minor pointer focus / handling issue that the event once handled by the preview window should not be passed onwards back to the scrollbar ?

[lfl-eholthouser]

Thanks for pointing this out @bernardkwok ! The render view zoom only checks right now if the cursor is within the bounds of the render view window which is causing that issue.

[pixelsandpointers]

I can try this one. Just for clarification, do we want to separate scrolling behavior for the attribute list and for the render view?

[kwokcb]

There are 3 scroll areas. The entire panel, the renderview, and just the attribute list. Each should trigger different behaviour. Only the panel scroll bar seems to affect the renderview.

[pixelsandpointers]

Thanks @kwokcb I'll take a look.

[jstone-lucasfilm]

Thanks to @kwokcb for reporting this issue, and to @HudsonHN for the fix in #1578!