With this patch, the toolbar of the Document's toolview has the same height as the navbar. With KToolBar, this was unfortunately not possible, since it seems KToolbar always adds a top margin, this seems a bug in KToolBar.
Still, with QToolBar, no functionality should be lost.
Before patch:
After patch:
As you can see, in the final screenshot the height of the navbar and the height of the toolbar are identical, which leads to a nice alignment especially in the case of where we only have the navbar visible.
If tabbar + navbar are enabled, this alignment breaks of course again:
