refactor: remove deprecated features and clean up related code in CachePlugin and CopyPastePlugin

packages/roosterjs-content-model-core/lib/corePlugin/cache/CachePlugin.ts

@@ -27,8 +27,6 @@ class CachePlugin implements PluginWithState<CachePluginState> {
     constructor(option: EditorOptions, contentDiv: HTMLDivElement) {
         this.state = {
             domIndexer: new DomIndexerImpl(
-                option.experimentalFeatures &&
-                    option.experimentalFeatures.indexOf('PersistCache') >= 0,
                 option.experimentalFeatures &&
                     option.experimentalFeatures.indexOf(
                         'KeepSelectionMarkerWhenEnteringTextNode'

packages/roosterjs-content-model-core/lib/corePlugin/cache/domIndexerImpl.ts

@@ -156,10 +156,7 @@ function unindex(node: Partial<IndexedSegmentNode>) {
  * Implementation of DomIndexer
  */
 export class DomIndexerImpl implements DomIndexer {
-    constructor(
-        private readonly persistCache?: boolean,
-        private readonly keepSelectionMarkerWhenEnteringTextNode?: boolean
-    ) {}
+    constructor(private readonly keepSelectionMarkerWhenEnteringTextNode?: boolean) {}
 
     onSegment(segmentNode: Node, paragraph: ContentModelParagraph, segment: ContentModelSegment[]) {
         const indexedText = segmentNode as IndexedSegmentNode;
@@ -349,10 +346,6 @@ export class DomIndexerImpl implements DomIndexer {
     }
 
     reconcileChildList(addedNodes: ArrayLike<Node>, removedNodes: ArrayLike<Node>): boolean {
-        if (!this.persistCache) {
-            return false;
-        }
-
         let canHandle = true;
         const context: ReconcileChildListContext = {
             segIndex: -1,
@@ -554,10 +547,6 @@ export class DomIndexerImpl implements DomIndexer {
             }
 
             this.onSegment(textNode, paragraph, textSegments);
-
-            if (!this.persistCache) {
-                delete paragraph.cachedElement;
-            }
         } else if (first?.segmentType == 'Entity' && first == last) {
             const wrapper = first.wrapper;
             const index = paragraph.segments.indexOf(first);

packages/roosterjs-content-model-core/lib/corePlugin/copyPaste/CopyPastePlugin.ts

@@ -44,7 +44,6 @@ class CopyPastePlugin implements PluginWithState<CopyPastePluginState> {
     private editor: IEditor | null = null;
     private disposer: (() => void) | null = null;
     private state: CopyPastePluginState;
-    private customCopyCutEnabled: boolean = false;
 
     /**
      * Construct a new instance of CopyPastePlugin
@@ -82,7 +81,6 @@ class CopyPastePlugin implements PluginWithState<CopyPastePluginState> {
                 beforeDispatch: e => this.onCutCopy(e, true /*isCut*/),
             },
         });
-        this.customCopyCutEnabled = editor.isExperimentalFeatureEnabled('CustomCopyCut');
     }
 
     /**
@@ -160,7 +158,7 @@ class CopyPastePlugin implements PluginWithState<CopyPastePluginState> {
                     isCut,
                 }).range;
 
-                if (this.customCopyCutEnabled && isClipboardEvent(event)) {
+                if (isClipboardEvent(event)) {
                     event.preventDefault();
                     const text = contentModelToText(pasteModel);
                     event.clipboardData?.setData('text/html', tempDiv.innerHTML);
@@ -235,10 +233,7 @@ class CopyPastePlugin implements PluginWithState<CopyPastePluginState> {
             tempDiv.style.left = '0';
             tempDiv.style.userSelect = 'text';
             tempDiv.contentEditable = 'true';
-
-            if (!this.customCopyCutEnabled) {
-                doc.body.appendChild(tempDiv);
-            }
+            doc.body.appendChild(tempDiv);
 
             this.state.tempDiv = tempDiv;
         }

packages/roosterjs-content-model-core/test/corePlugin/cache/domIndexerImplTest.ts

@@ -1169,7 +1169,7 @@ describe('domIndexerImpl.reconcileSelection', () => {
     });
 
     it("Keeps selection marker's format when moving selection from an empty div to a text node inside", () => {
-        domIndexerImpl = new DomIndexerImpl(undefined, true);
+        domIndexerImpl = new DomIndexerImpl(true);
         const divNode = document.createElement('div');
         const textNode = document.createTextNode('t') as any;
         divNode.appendChild(textNode);

packages/roosterjs-content-model-core/test/corePlugin/copyPaste/CopyPastePluginTest.ts

@@ -373,7 +373,6 @@ describe('CopyPastePlugin |', () => {
 
         describe('withCustomCopyCutEnabled |', () => {
             beforeEach(() => {
-                editor.isExperimentalFeatureEnabled = () => true;
                 plugin.initialize(editor);
             });
 

packages/roosterjs-content-model-types/lib/editor/ExperimentalFeature.ts

@@ -5,7 +5,7 @@
  */
 export type ExperimentalFeature =
     /**
-     * When this feature is enabled, we will persist a content model in memory as long as we can,
+     * @deprecated When this feature is enabled, we will persist a content model in memory as long as we can,
      * and use cached element when write back if it is not changed.
      */
     | 'PersistCache'
@@ -20,8 +20,9 @@ export type ExperimentalFeature =
      */
     | 'HandleEnterKey'
     /**
-     *  Prevent default browser behavior for copy/cut event,
-     *  and set the clipboard data with custom implementation.
+     * @deprecated
+     * Prevent default browser behavior for copy/cut event,
+     * and set the clipboard data with custom implementation.
      */
     | 'CustomCopyCut'
     /**