Add support for horizontal scrolling in Tree using mouse buttons (WHEEL_LEFT/WHEEL_RIGHT)

[mieldepoche]

Describe the project you are working on

No relevant

Describe the problem or limitation you are having in your project

The editor FileSystem and Scene tabs are usually not wide enough to display their whole content on my display and editor interface scale.
As such I often need to scroll horizontally to read e.g. a full file name which I can't do using the secondary mousewheel of my mouse at the moment.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

Make horizontal mousewheel event scroll horizontally in ScrollContainers.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

/

If this enhancement will not be used often, can it be worked around with a few lines of script?

I would use it often

Is there a reason why this should be core and not an add-on in the asset library?

its kinda core already

[AThousandShips]

It should be, but the Editor Filesystem isn't a scroll container but a Tree, that does not have this as far as I can see

[YuriSizov]

Indeed, this is Tree, and ScrollContainer already supports WHEEL_LEFT/WHEEL_RIGHT.