go back to prompt on second drag/drop failure

Author: evanw

code.js

@@ -75,6 +75,10 @@
  }
 
  function showLoadingError(text) {
+ promptText.style.display = 'block';
+ toolbar.style.display = 'none';
+ statusBar.style.display = 'none';
+ canvas.style.display = 'none';
  errorText.style.display = 'block';
  errorText.textContent = text;
  }
@@ -454,6 +458,7 @@
  promptText.style.display = 'none';
  toolbar.style.display = 'flex';
  statusBar.style.display = 'flex';
+ canvas.style.display = 'block';
  const sm = parseSourceMap(map);
 
  // Populate the file picker