Fix issue where change event would not fire on file selection

js/fileUtils.js

@@ -34,6 +34,11 @@ export async function promptForFileReferences() {
     // Can this fail? Do we ever reject?
     const fileInput = document.createElement("input");
     fileInput.type = "file";
+    // Not entirely sure why this is needed, since the input
+    // was just created, but somehow this helps prevent change
+    // events from getting swallowed.
+    // https://stackoverflow.com/a/12102992/1263117
+    fileInput.value = null;
     fileInput.addEventListener("change", e => {
       resolve(e.target.files);
     });