derp

packages/mui/src/utils/contentworker.ts

@@ -597,22 +597,19 @@ self.onmessage = async (evt) => {
       break;
     }
     case "erase": {
+      startX = evt.data.x;
+      startY = evt.data.y;
       if (evt.data.buttons === 0) {
         // here we don't draw BUT if you look at animateBrush, you'll see that we'll just repaint the
         // overlay and then render the translucent brush
         if (!recording) {
           overlayCtx.fillStyle = GUIDE_FILL;
           recording = true;
+          requestAnimationFrame(animateBrush);
         }
-        // IS this even necessary? I guess if the mouse moves faster than the screen refresh it might cut some
-        // old frames out of the list
-        cancelAnimationFrame(_frame);
-        requestAnimationFrame(animateBrush);
       } else if (evt.data.buttons === 1) {
         /* nop */
-        if (recording) {
-          recording = false;
-        }
+        recording = false;
         eraseBrush(evt.data.x, evt.data.y, brush);
       }
       break;