Fix rebind issue with NME

dist/preview release/documentation.d.ts

@@ -74197,6 +74197,8 @@ declare module BABYLON.GUI {
         private _barImageHeight;
         private _horizontalBarImageHeight;
         private _verticalBarImageHeight;
+        private _oldWindowContentsWidth;
+        private _oldWindowContentsHeight;
         /**
          * Gets the horizontal scrollbar
          */

dist/preview release/gui/babylon.gui.d.ts

@@ -3057,6 +3057,8 @@ declare module BABYLON.GUI {
         private _barImageHeight;
         private _horizontalBarImageHeight;
         private _verticalBarImageHeight;
+        private _oldWindowContentsWidth;
+        private _oldWindowContentsHeight;
         /**
          * Gets the horizontal scrollbar
          */

dist/preview release/gui/babylon.gui.module.d.ts

@@ -3186,6 +3186,8 @@ declare module "babylonjs-gui/2D/controls/scrollViewers/scrollViewer" {
         private _barImageHeight;
         private _horizontalBarImageHeight;
         private _verticalBarImageHeight;
+        private _oldWindowContentsWidth;
+        private _oldWindowContentsHeight;
         /**
          * Gets the horizontal scrollbar
          */
@@ -7426,6 +7428,8 @@ declare module BABYLON.GUI {
         private _barImageHeight;
         private _horizontalBarImageHeight;
         private _verticalBarImageHeight;
+        private _oldWindowContentsWidth;
+        private _oldWindowContentsHeight;
         /**
          * Gets the horizontal scrollbar
          */

src/Materials/shaderMaterial.ts

@@ -8,11 +8,12 @@ import { VertexBuffer } from "../Meshes/buffer";
 import { BaseTexture } from "../Materials/Textures/baseTexture";
 import { Texture } from "../Materials/Textures/texture";
 import { MaterialHelper } from "./materialHelper";
-import { IEffectCreationOptions } from "./effect";
+import { IEffectCreationOptions, Effect } from "./effect";
 import { Material } from "./material";
 import { _TypeStore } from '../Misc/typeStore';
 import { Color3, Color4 } from '../Maths/math.color';
 import { EffectFallbacks } from './effectFallbacks';
+import { Nullable } from '../types';
 
 /**
  * Defines the options associated with the creation of a shader material.
@@ -759,6 +760,11 @@ export class ShaderMaterial extends Material {
         this._afterBind(mesh);
     }
 
+    protected _afterBind(mesh?: Mesh): void {
+        super._afterBind(mesh);
+        this.getScene()._cachedEffect = this._effect;
+    }
+
     /**
      * Gets the active textures from the material
      * @returns an array of textures