Fix restoring previous state with instant feedback enabled

src/scripts/h5p-crossword-content.js

@@ -254,6 +254,14 @@ export default class CrosswordContent {
     }
   }
 
+  /**
+   * Check whether all relevant cells have been filled.
+   * @return {boolean} True, if all relevant cells have been filled, else false.
+   */
+  isTableFilled() {
+    return this.table.isFilled();
+  }
+
   /**
    * Show solution.
    */
@@ -291,7 +299,7 @@ export default class CrosswordContent {
 
     this.answerGiven = true;
 
-    if (this.table.isFilled()) {
+    if (this.isTableFilled()) {
       this.callbacks.onTableFilled();
     }
   }

src/scripts/h5p-crossword.js

@@ -143,6 +143,11 @@ export default class Crossword extends H5P.Question {
       // Register content with H5P.Question
       this.setContent(this.content.getDOM());
 
+      // Previous state might have been a filled table
+      if (this.params.behaviour.enableInstantFeedback && this.content.isTableFilled()) {
+        this.checkAnswer();
+      }
+
       // Content may need a resize once it's displayed (media queries or pseudo elements)
       Util.waitForDOM('.h5p-crossword-input-container', () => {
         setTimeout(() => {
@@ -197,6 +202,10 @@ export default class Crossword extends H5P.Question {
      * Check answer.
      */
     this.checkAnswer = () => {
+      if (!this.content) {
+        return; // Call by previous state, not ready yet
+      }
+
       this.content.checkAnswer();
 
       this.hideButton('check-answer');