Do not invert deltaX / deltaY in wheelHandler when the shift key is down

[softwarenerd]

Description

This PR addresses #3755. The fix was to remove the code in Data Grid that inverted deltaX and deltaY when the shift key is pressed during wheel events. It is unnecessary code.

Trackpads already have gestures for scrolling vertically and scrolling horizontally, so shift key inversion isn't necessary for wheel events that come from a trackpad.

By the time a React onWheel handler runs, the deltaX and deltaY values are already inverted by the browser engine when the event comes from a mouse and the shift key is down.

So this code:

// When the user is holding the shift key, invert delta X and delta Y.
if (e.shiftKey) {
	[deltaX, deltaY] = [deltaY, deltaX];
}

was causing a double inversion of deltaX and deltaY for mouse-initiated wheel events.

(*And, there is no way in a React onWheel event handler to tell whether the event came from a trackpad or a mouse.)

Release Notes

New Features

• N/A

Bug Fixes

• data explorer's horizontal scroll with shift and scroll wheel #3755 Fix mouse wheel handling in Data Explorer so that holding the shift key down will invert the scroll direction from vertical to horizontal.

QA Notes

• None

[Copilot]

Pull Request Overview

This PR fixes mouse wheel handling in the Data Explorer component by removing unnecessary deltaX/deltaY inversion logic when the shift key is pressed. The browser already handles this inversion automatically, so the custom code was causing double inversion for mouse wheel events.

Key Changes

• Removed shift key delta inversion logic from wheel event handler
• Preserved existing alt key scroll amplification behavior

[github-actions]

E2E Tests 🚀
This PR will run tests tagged with: @:critical

^{readme  valid tags}

[juliasilge]

This is working great for me, and it's really nice to be able to shift horizontally with my scroll wheel! 🙌