Attempt to fix scratch3 hat

Author: harbaum

webusb/scratch3/lib.min.js

@@ -268246,7 +268246,8 @@ function () {
 
       return new Promise(function (resolve) {
         // it must never happend that wait4input_resolve is set
-        // at this time.
+        // at this time as this means that the previous request has
+        // not been resolved.
         if (_this7.expect.wait4input_resolve != undefined) console.log("COLLISION!");
         _this7.expect.wait4input_resolve = resolve;
       }).then(function () {
@@ -268410,25 +268411,28 @@ function () {
       result = JSON.parse(msg);
 
       if (this.expect !== undefined) {
-        this.cancelReplyTimeout(); // check if the result contains the expected keys
+        this.cancelReplyTimeout(); // there _must_ be some entries in this.expect
 
-        var reply_ok = true;
-        var keys = Object.keys(this.expect.entries);
+        if (this.expect.entries === undefined) console.log("No entries???");else {
+          // check if the result contains the expected keys
+          var reply_ok = true;
+          var keys = Object.keys(this.expect.entries);
 
-        for (var i = 0; i < keys.length; i++) {
-          if (result[keys[i]].toLowerCase() !== this.expect.entries[keys[i]].toLowerCase()) {
-            console.log("Missing expected reply parameter:", keys[i], ":", this.expect.entries["expect"][keys[i]], "-", msg);
-            reply_ok = false;
+          for (var i = 0; i < keys.length; i++) {
+            if (result[keys[i]].toLowerCase() !== this.expect.entries[keys[i]].toLowerCase()) {
+              console.log("Missing expected reply parameter:", keys[i], ":", this.expect.entries["expect"][keys[i]], "-", msg);
+              reply_ok = false;
+            }
           }
-        }
 
-        if (result[this.expect.value] === undefined) reply_ok = false;
+          if (result[this.expect.value] === undefined) reply_ok = false;
 
-        if (reply_ok) {
-          this.expect.resolve(result[this.expect.value]);
-          if (this.expect.wait4input_resolve !== undefined) this.expect.wait4input_resolve();
-          this.expect = undefined;
-        } else console.log("reply expect failed");
+          if (reply_ok) {
+            this.expect.resolve(result[this.expect.value]);
+            if (this.expect.wait4input_resolve !== undefined) this.expect.wait4input_resolve();
+            this.expect = undefined;
+          } else console.log("reply expect failed");
+        }
       }
     }
   }, {
@@ -268835,7 +268839,9 @@ function () {
     value: function hatHandler() {
       var _this14 = this;
 
-      // decrease current timeout counter
+      // decrease current timeout counter. This is used since we are
+      // not notified when a hat is being removed. This counter running
+      // down means that the hat has probably been deleted fromt he workspace.
       this.hat.input[this.hat.next] = this.hat.input[this.hat.next] - 1;
 
       if (!this.hat.input[this.hat.next]) {