Dropdown such as ComboBox causes scrolling in modal.

[gohde]

A ComboBox will be constrained by a modal and start scrolling in the modal instead of simply laying on top of it as one would expect from a native dropdown menu.

[theetrain]

It appears this is an issue in Carbon v10 and v11 CSS, and solutions and workarounds are being tracked here carbon-design-system/carbon#7565

One of the suggested workarounds is to use a Select instead of a Combobox until a long-term solution is found in the core Carbon library.

carbon-design-system/carbon#9732

[gohde]

In case someone else comes over this problem. My workaround for the time being was the following hack. No collateral damage from this solution so far that I could see in my app but ymmv.

<style>
	:global(.bx--modal-content) {
		overflow: visible;
	}

	:global(.bx--modal.is-visible .bx--modal-container) {
		overflow: visible;
	}
</style>