Fix multi-column item tooltip overflow

If tooltips with more than 1 column overflow the viewport they are now
moved to the left, as much as needed and the viewport allows

Author: majochem

src/Classes/Tooltip.lua

@@ -367,9 +367,15 @@ function TooltipClass:Draw(x, y, w, h, viewPort)
 			ttY = m_max(viewPort.y, y + h - ttH)
 		end
 	end
-
+	-- Initial column calculation
 	local columns, maxColumnHeight, drawStack = self:CalculateColumns(ttY, ttX, ttH, ttW, viewPort)
 
+	-- If extra columns don't fit, shift to left and recalculate drawStack
+	if columns > 1 and ttW * columns + ttX >= viewPort.x + viewPort.width then
+		ttX = m_max(viewPort.x, viewPort.x + viewPort.width - ttW * columns)
+		columns, maxColumnHeight, drawStack = self:CalculateColumns(ttY, ttX, ttH, ttW, viewPort)
+	end
+
 	-- background shading currently must be drawn before text lines.  API change will allow something like the commented lines below
 	SetDrawColor(0, 0, 0, .85)
 	--SetDrawLayer(nil, GetDrawLayer() - 5)