fOldMovingTab
fOldMovingTab.OffsetBy(toTab->tabRect.Width(), 0);
toTab->tabRect.OffsetBy(-fOldMovingTab.Width(), 0);
fOldMovingTab.OffsetBy(-toTab->tabRect.Width(), 0);
toTab->tabRect.OffsetBy(fOldMovingTab.Width(), 0);
fOldMovingTab = BRect(0, 0, -1, -1);
if (fOldMovingTab.IsValid() == false)
fOldMovingTab = _tab->tabRect;
fOldMovingTab.OffsetBy(toTab->tabRect.Width(), 0);
toTab->tabRect.OffsetBy(-fOldMovingTab.Width(), 0);
fOldMovingTab.OffsetBy(-toTab->tabRect.Width(), 0);
toTab->tabRect.OffsetBy(fOldMovingTab.Width(), 0);
BRect fOldMovingTab;