lltabcontainer.cpp

			S32 available_width_with_arrows = getRect().getWidth() - mRightTabBtnOffset - 2 * (LLPANEL_BORDER_WIDTH + tabcntr_arrow_btn_size  + tabcntr_arrow_btn_size + 1);
			// subtract off reserved portion on left
			available_width_with_arrows -= tabcntr_tab_partial_width;

			S32 running_tab_width = 0;
			setMaxScrollPos(getTabCount());
			for(tuple_list_t::reverse_iterator tab_it = mTabList.rbegin(); tab_it != mTabList.rend(); ++tab_it)
			{
				running_tab_width += (*tab_it)->mButton->getRect().getWidth();
				if (running_tab_width > available_width_with_arrows)
				{
					break;
				}
				setMaxScrollPos(getMaxScrollPos()-1);
			}
			// in case last tab doesn't actually fit on screen, make it the last scrolling position
			setMaxScrollPos(llmin(getMaxScrollPos(), getTabCount() - 1));
			no_scroll = FALSE;
		}
	}
	if (no_scroll)
	{
		setMaxScrollPos(0);
		setScrollPos(0);
	}
	if (getScrollPos() > getMaxScrollPos())
	{
		setScrollPos(getMaxScrollPos()); // maybe just enforce this via limits in setScrollPos instead?
	}
}

void LLTabContainer::commitHoveredButton(S32 x, S32 y)
{
	if (!getTabsHidden() && hasMouseCapture())
	{
		for(tuple_list_t::iterator iter = mTabList.begin(); iter != mTabList.end(); ++iter)
		{
			LLTabTuple* tuple = *iter;
			S32 local_x = x - tuple->mButton->getRect().mLeft;
			S32 local_y = y - tuple->mButton->getRect().mBottom;
			if (tuple->mButton->pointInView(local_x, local_y) && tuple->mButton->getEnabled() && !tuple->mTabPanel->getVisible())
			{
				tuple->mButton->onCommit();
			}
		}
	}
}