[lets-see-how-deep-the-rabbit-hole-goes] A quick PR for testing the matrix widget upstream, as we want to try to recreate a nebulous bug

<see below>

Author: SonicScrewdriver

packages/perseus-score/src/widgets/matrix/validate-matrix.ts

@@ -18,7 +18,10 @@ import type {
 function validateMatrix(userInput: PerseusMatrixUserInput): ValidationResult {
     const supplied = userInput.answers;
     const suppliedSize = getMatrixSize(supplied);
-
+    // eslint-disable-next-line no-console
+    console.log("suppliedSize", suppliedSize);
+    // eslint-disable-next-line no-console
+    console.log("supplied", supplied);
     for (let row = 0; row < suppliedSize[0]; row++) {
         for (let col = 0; col < suppliedSize[1]; col++) {
             if (

packages/perseus/src/widgets/matrix/matrix.tsx

@@ -151,7 +151,8 @@ class Matrix extends React.Component<Props, State> implements Widget {
                 inputPaths.push(inputPath);
             }
         }
-
+        // eslint-disable-next-line no-console
+        console.log("inputPaths", inputPaths);
         return inputPaths;
     };
 
@@ -301,13 +302,17 @@ class Matrix extends React.Component<Props, State> implements Widget {
             cb,
         );
         this.props.trackInteraction();
+        // eslint-disable-next-line no-console
+        console.log("onValueChange", answers);
     };
 
     /**
      * TODO: remove this when everything is pulling from Renderer state
      * @deprecated get user input from Renderer state
      */
     getUserInput(): PerseusMatrixUserInput {
+        // eslint-disable-next-line no-console
+        console.log("getUserInput", this.props.userInput);
         return this.props.userInput;
     }
 
@@ -321,10 +326,13 @@ class Matrix extends React.Component<Props, State> implements Widget {
      */
     getSerializedState(): any {
         const {userInput, ...rest} = this.props;
-        return {
+        const serializedState = {
             ...rest,
             answers: userInput.answers,
         };
+        // eslint-disable-next-line no-console
+        console.log("serializedState", serializedState);
+        return serializedState;
     }
 
     render(): React.ReactNode {
@@ -563,13 +571,15 @@ function getCorrectUserInput(
 function getUserInputFromSerializedState(
     serializedState: any,
 ): PerseusMatrixUserInput {
+    // eslint-disable-next-line no-console
+    console.log("getUserInputFromSerializedState", serializedState);
     return {answers: serializedState.answers};
 }
 
 export default {
     name: "matrix",
     displayName: "Matrix",
-    hidden: true,
+    hidden: false,
     widget: Matrix,
     transform,
     staticTransform: transform,