Fix: Vector disappears when panning.

partially solved fnicollet#23
ref: Leaflet/Leaflet@c931d330fea

src/layer/vector/Canvas.js

@@ -87,6 +87,9 @@ L.Canvas = L.Renderer.extend({
 
 		// translate so we use the same path coordinates after canvas element moves
 		this._ctx.translate(-b.min.x, -b.min.y);
+
+		// Tell paths to redraw themselves
+		this.fire('update');
 	},
 
 	_initPath: function (layer) {

src/layer/vector/Renderer.js

@@ -45,13 +45,10 @@ L.Renderer = L.Layer.extend({
 
 		this.getPane().appendChild(this._container);
 		this._update();
-
-		this._map.on('rotate', this._update, this);
 	},
 
 	onRemove: function () {
 		L.DomUtil.remove(this._container);
-		this._map.off('rotate', this._update, this);
 	},
 
 	getEvents: function () {
@@ -90,7 +87,8 @@ L.Renderer = L.Layer.extend({
 	},
 
 	_update: function () {
-		// update pixel bounds of renderer container (for positioning/sizing/clipping later)
+		// Update pixel bounds of renderer container (for positioning/sizing/clipping later)
+		// Subclasses are responsible of firing the 'update' event.
 		var p = this.options.padding,
 		    map = this._map,
 		    size = this._map.getSize(),
@@ -111,8 +109,6 @@ L.Renderer = L.Layer.extend({
 
 		this._center = this._map.getCenter();
 		this._zoom = this._map.getZoom();
-
-		this.fire('update');
 	}
 });
 

src/layer/vector/SVG.js

@@ -78,6 +78,8 @@ L.SVG = L.Renderer.extend({
 		// movement: update container viewBox so that we don't have to change coordinates of individual layers
 		L.DomUtil.setPosition(container, b.min);
 		container.setAttribute('viewBox', [b.min.x, b.min.y, size.x, size.y].join(' '));
+
+		this.fire('update');
 	},
 
 	// methods below are called by vector layers implementations