Some of the controls that have a small width and the content can't be fully visible have horizontal scrollbars, like ListView, TreeView in order to accommodate the entire content.
When trying to scroll horizontally by using the keyboard to see the entire content this is not possible.
The horizontal scrollbar exists but cannot be adjusted using the keyboard, only by mouse.
So via keyboard only, user cannot read fully the text.

(Same applies to vertical scrolling, for example when a cell height exceeds the height of the viewport).