Fix error on resizing

This error "RenderingCanceledError: Page rendering has been canceled" occurred because
`class RenderingCanceledError extends Error` was defined incompletely.
```
    Object.setPrototypeOf(this, RenderingCanceledError.prototype);
```
is necessary because [Extending built-ins like Error, Array, and Map may no longer work](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work)

src/ts/adapt/adaptviewer.ts

@@ -1218,6 +1218,9 @@ class RenderingCanceledError extends Error {
 
   constructor() {
     super();
+    // Set the prototype explicitly.
+    // https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+    Object.setPrototypeOf(this, RenderingCanceledError.prototype);
     this.stack = new Error().stack;
   }
 }