Tree: Style issue - CSS Height is being ignored

[jbjhjm]

Describe the bug
For large trees, users may want to limit the height and make the tree scrollable.
Currently, setting height or max-height on ui5-tree will not work, because ui5-list ignores the set height and will overflow it's parent element.

Looks like the reason for this is that the child ui5-list ignores its parent's height.
(setting overflow:auto on ui5-tree would not work well because ui5-list is set to overflow:auto, too, which would create a second scrollbar.)

I tried to fix this by using addCustomCss, but I'm afraid this does not work. Possibly because it is another webcomponent with it's own shadow dom:

addCustomCSS("ui5-tree", `ui5-list { height:100% }`);

To reproduce
Create a ui5-tree with many entries and limit the height using css.

Expected behavior
ui5-list should not be higher than it's parent/should not overflow it.
It's maximal height within ui5-tree should be 100%.

Screenshots
If applicable, add screenshots to help explain your problem.

Context

• UI5 Web Components: 1.0.0rc10
• OS/Platform: Win 10
• Browser (if relevant): Chrome 87