move some code to extension manager

packages/core/src/Editor.ts

@@ -1,7 +1,7 @@
 import { EditorState, TextSelection } from 'prosemirror-state'
 import { EditorView} from 'prosemirror-view'
 import { Schema, DOMParser, DOMSerializer } from 'prosemirror-model'
-import { inputRules, undoInputRule } from 'prosemirror-inputrules'
+import { undoInputRule } from 'prosemirror-inputrules'
 import { keymap } from 'prosemirror-keymap'
 import { baseKeymap } from 'prosemirror-commands'
 import { dropCursor } from 'prosemirror-dropcursor'
@@ -121,9 +121,6 @@ export class Editor extends EventEmitter {
   private get plugins() {
     return [
       ...this.extensionManager.plugins,
-      ...this.extensionManager.keymaps,
-      ...this.extensionManager.pasteRules,
-      inputRules({ rules: this.extensionManager.inputRules }),
       keymap({ Backspace: undoInputRule }),
       keymap(baseKeymap),
       dropCursor(),

packages/core/src/ExtensionManager.ts

@@ -1,5 +1,6 @@
-import { keymap } from 'prosemirror-keymap'
 import collect from 'collect.js'
+import { keymap } from 'prosemirror-keymap'
+import { inputRules } from 'prosemirror-inputrules'
 import { Editor } from './Editor'
 import Extension from './Extension'
 import Node from './Node'
@@ -43,9 +44,16 @@ export default class ExtensionManager {
   }
 
   get plugins(): any {
-    return collect(this.extensions)
+    const plugins = collect(this.extensions)
       .flatMap(extension => extension.plugins())
       .toArray()
+
+    return [
+      ...plugins,
+      ...this.keymaps,
+      ...this.pasteRules,
+      inputRules({ rules: this.inputRules }),
+    ]
   }
 
   get inputRules(): any {