Merge pull request #12504 from CesiumGS/longer-deprecation

Extend recommended deprecation window

Documentation/Contributors/CodingGuide/README.md

@@ -923,7 +923,7 @@ An `@experimental` API is subject to breaking changes in future Cesium releases
 
 A public identifier (class, function, property) should be deprecated before being removed. To do so:
 
-- Decide on which future version the deprecated API should be removed. This is on a case-by-case basis depending on how badly it impacts users and Cesium development. Most deprecated APIs will removed in 1-3 releases. This can be discussed in the pull request if needed.
+- Decide on which future version the deprecated API should be removed. This is on a case-by-case basis depending on how badly it impacts users and Cesium development. Most deprecated APIs will removed in 3-6 releases. This can be discussed in the pull request if needed.
 - Use [`deprecationWarning`](https://github.com/CesiumGS/cesium/blob/main/Source/Core/deprecationWarning.js) to warn users that the API is deprecated and what proactive changes they can take, e.g.,
 
 ```javascript

packages/engine/Source/Renderer/Context.js

@@ -4,7 +4,6 @@ import ComponentDatatype from "../Core/ComponentDatatype.js";
 import createGuid from "../Core/createGuid.js";
 import defaultValue from "../Core/defaultValue.js";
 import defined from "../Core/defined.js";
-import deprecationWarning from "../Core/deprecationWarning.js";
 import destroyObject from "../Core/destroyObject.js";
 import DeveloperError from "../Core/DeveloperError.js";
 import Geometry from "../Core/Geometry.js";
@@ -1671,7 +1670,4 @@ Context.prototype.destroy = function () {
   return destroyObject(this);
 };
 
-// Used for specs.
-Context._deprecationWarning = deprecationWarning;
-
 export default Context;

packages/engine/Specs/Renderer/ContextSpec.js

@@ -17,7 +17,6 @@ describe(
 
     beforeAll(function () {
       context = createContext();
-      spyOn(Context, "_deprecationWarning");
     });
 
     afterAll(function () {