Tab bar body doesn't handle scroll event. Only scrollbar does

[fricze]

Describe the bug
When you add more tabs to particular node tab bar becomes scrollable. Unfortunately tab bar body doesn't handle scroll event. Only scrollbar does. Looking at the code, it seems to be a bug. There's a scroll change handled when tab bar response is hovered, but it seems that particular tabs cover the tab bar response and do not allow event to bubble as expected.

Relevant code is lines 1163 - 1165, from file src/widgets/dock_area/show/leaf.rs

if tabbar_response.hovered() {
    leaf.scroll += ui.input(|i| i.smooth_scroll_delta.y + i.smooth_scroll_delta.x);
}

To Reproduce
Steps to reproduce the behavior:

1. Open "Tab add" example
2. Add a bunch of new tabs so they overflow available space and scrollbar appears
3. Place pointer on a tab, not scrollbar, and try to scroll with mouse or touchpad
4. See that tab bar doesn't scroll

Expected behavior
Tab bar should scroll when pointer is placed in tab bar body and user scrolls with mouse or touchpad

Screenshots
Scroll works only when pointer is placed above scrollbar
https://github.com/user-attachments/assets/12f24ad7-b6a1-4cbc-91a5-40fb5ab2734e