Draw Grid Mode: fixed a problem where "continuous drawing" would redraw all...

Draw Grid Mode: fixed a problem where "continuous drawing" would redraw all previously drawn shapes each time a drawing was finished. Fixes #912

Source/Plugins/BuilderModes/ClassicModes/DrawGridMode.cs

@@ -152,6 +152,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			{
 				// Reset settings
 				points.Clear();
+				gridpoints.Clear();
 				labels.Clear();
 				drawingautoclosed = false;