now prop OptButtonLayout here.
it sets buttons on left, on right.
possible buttons:
<
>
v
+
possible layouts (separator ,):
,v
<>,v
<>,v+
<>v,
,<>v
,<>v+
<,>
<,>v
v<,>
...etc
change:
plus-tab paints not via font. but via Canvas.Line.
change:
can show plus-tab and plus-button. or one of them.
plus-button better. its not hidden if 100 tabs.