* Added _MinTabeSize() to BTabView. It makes sure that the BTabView displays
at least two tabs. In the future it should also add the room to display some
buttons for cycling the currently displayed tabs left/right if there is more
than can fit.
* In BTabView::Min/Max/PreferredSize(), use _MinTabSize() to compute the
respective size.
* Improve Tab rendering code so there are no ugly overlaps at the right edge
if the tabs falls directly on the view edge.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31157 a95241bf-73f2-0310-859d-f6bbb57e9c96
b3601d823c