Windows Feature request: Enable Shift + scroll for horizontal scrolling

[testlabauto]

(from: #11040)

System details:

Positron and OS details:

I'm using a Dell Latitude 5420, running Windows 11 Enterprise version 24H2, OS build 26100.7171.

@jonvanausdeln was able to repro with 2026.01.0-71

Session details:

N/A

Describe the issue:

Many applications allow the use of horizontal scrolling by holding the Shift button and scrolling vertically. This would be helpful feature implemented in Positron for those with a mouse without a dedicated horizontal scroll mechanism. Relatedly, for those that have a device with a dedicated horizontal scrolling mechanism, it would be great to be able to use it. Currently horizontal scrolling either by holding shift and scrolling vertically, or using a dedicated horizontal scrolling mechanism on a mouse does not work. This feature would especially be useful in the data viewer while previewing .csv files to import or scrolling across data frames for visual inspection.

I tried Shift + scroll in VS Code and it worked as expected. I was running VS Code 1.107.0. It also listed Electron 39.2.3 if that helps.

I then proceeded to uninstalling the Logitech Options+ software. After uninstalling, Shift + scroll worked on VS Code, but it did not work in Positron.

Steps to reproduce the issue:

1. On windows, attempt to horizontally scroll with SHIFT + the vertical scroller
2. Note that this works in VSCode

Expected or desired behavior:

Side scroll works on windows with SHIFT and vertical scroller

Were there any error messages in the UI, Output panel, or Developer Tools console?

No