Update LibClass.lua

Correct the handling of negative indexes.

Author: JohnHind

Winsh/Libraries/LibClass.lua

@@ -194,20 +194,20 @@ do  -- Class 'List' (extends partial implementation in C)
 			self[ip] = v
 		end
 	end
-	function _TID:remove(p1, p2)
-		T.checkmethod(self, _C)
-		local t = #self
-		p1 = T.tonumber(p1 or t)
-		if p1 < 0 then p1 = t + p1 end
-		if p1 < 1 or p1 > t then error("Remove: index out of range") end
-		p2 = T.tonumber(p2 or p1)
-		if p2 < 0 then p2 = t + p2 end
-		if p2 < p1 then p2 = p1 end
-		local d = p2 - p1 + 1
-		for i=p2+1, t do self[i-d] = self[i] end
-		for i=t, t-d+1, -1 do self[i] = nil end
-	end
-	function _TID:reverse()
+        function _TID:remove(p1, p2)
+            T.checkmethod(self, _C)
+            local t = #self + 1
+            p1 = T.tonumber(p1 or t-1)
+            if p1 < 0 then p1 = t + p1 end
+            if p1 < 1 or p1 >= t then error("Remove: index out of range") end
+            p2 = T.tonumber(p2 or p1)
+            if p2 < 0 then p2 = t + p2 end
+            if p2 < p1 then p2 = p1 end
+            local d = p2 - p1 + 1
+            for i=p2+1, t-1 do self[i-d] = self[i] end
+            for i=t-1, t-d, -1 do self[i] = nil end
+        end
+        function _TID:reverse()
 		T.checkmethod(self, _C)
 		local e = #self
 		for i=1, e/2 do