I see that in the Component Tree a hint is displayed when hovering over a row, only if the text does not fit the width of the window (see attached screenshot).
But it is displayed only according to the row size in the tree. When hovering the mouse over the vertical scroll bar, it disappears and does not interfere with its use.
By the way, what OS and widget set do you have (win32, gtk2, qt5, cocoa)?