fix perf improvements

Author: vankeisb

tea-cup/src/TeaCup/Memo.ts

@@ -59,6 +59,6 @@ class Memo<T> extends React.Component<MemoProps> {
   }
 
   shouldComponentUpdate(nextProps: Readonly<MemoProps>, nextState: Readonly<{}>, nextContext: any): boolean {
-    return this.props.compareFn(this.props.value, nextProps.value);
+    return !this.props.compareFn(this.props.value, nextProps.value);
   }
 }

tea-cup/src/TeaCup/Program.ts

@@ -94,26 +94,24 @@ export class Program<Model, Msg> extends Component<ProgramProps<Model, Msg>, nev
       // perform commands in a separate timout, to
       // make sure that this dispatch is done
       const cmd = updated[1];
-      // if (!(cmd instanceof CmdNone)) {
+      if (!(cmd instanceof CmdNone)) {
         setTimeout(() => {
           // console.log("dispatch: processing commands");
           // debug("performing command", updated[1]);
           updated[1].execute(d);
           // debug("<<<  done");
         }, 0);
-      // }
+      }
 
-      // const needsUpdate = this.currentModel === updated[0];
+      const needsUpdate = this.currentModel !== updated[0];
 
       this.currentModel = updated[0];
       this.currentSub = newSub;
 
       // trigger rendering
-      // console.log('render')
-      // if (needsUpdate) {
-        // console.log('render update')
+      if (needsUpdate) {
         this.forceUpdate();
-      // }
+      }
     }
   }