Move _containerLeft init before transform (#26)

src/layer/Popup.js

@@ -363,6 +363,9 @@ L.Popup = L.Layer.extend({
 		    offset = L.point(this.options.offset),
 		    anchor = this._getAnchor();
 
+		var bottom = this._containerBottom = -offset.y,
+		    left = this._containerLeft = -Math.round(this._containerWidth / 2) + offset.x;
+
 		if (this._zoomAnimated) {
 			if (this._map._rotate) {
 				// rotation relative to the marker's anchor
@@ -375,9 +378,6 @@ L.Popup = L.Layer.extend({
 			offset = offset.add(pos).add(anchor);
 		}
 
-		var bottom = this._containerBottom = -offset.y,
-		    left = this._containerLeft = -Math.round(this._containerWidth / 2) + offset.x;
-
 		// bottom position the popup in case the height of the popup changes (images loading etc)
 		this._container.style.bottom = bottom + 'px';
 		this._container.style.left = left + 'px';