QDockWidget tabbed scrollbutton tooltip error

If many dock windows are tabbed together, the left/right scroll buttons appear. First, when hovering over the buttons, the tooltip event seems to be handled by the tabs below the buttons, not the buttons themselves. I would expect the tooltip to be either something indicating the button function (scroll left/right), or possibly something like "Scroll to Red Tab", or whatever will be made visible by the click. The second issue is that if the text on the leftmost-visible label is visible, but the decoration surrounding the text is obscured (ie. the several-pixel border), clicking 'left' scrolls only those few pixels, so that the full tab is visible. Since the beginning of the label is visible, I'd expect that clicking 'left' would advance to the previous tab. I can see why it does this in the general case (don't scroll past something the user hasn't read yet), but in this case, the text is visible.