Scrolling should be validated when there are no tabs but sticky buttons are present

[schtauffen]

Describe the bug

Currently users can scroll tabsets when no tabs are open but there are stickybuttons persent.

Your Example Website or App

No response

Steps to Reproduce the Bug or Issue

Add a sticky button such as:

<Layout onRenderTabSet={(node, renderValues) =>  {
  renderValues.push(<button>+</button>);
  }} />

Close any tabs that may be present.
Observe that you can use your mouse scroll wheel to move the sticky buttons around, even out of visibility range.

Expected behavior

We have patched flexlayout to just setPosition(0) in this scenario:

// updateVisibleTabs in TabOverflowHook.tsx (Line 96 for 18.2.0)
            if (node.getChildren().length === 0 && stickyButtonsSize !== 0) {
                setPosition(0);
            }

A better solution would validate if sticky buttons are hidden to allow scrolling but in our case disallowing it is sufficient.

Operating System

macOS

Browser Type?

Google Chrome

Browser Version

n/a

Screenshots or Videos

Prior to scrolling:

Sticky button scrolled into other positions:

Additional context

No response