Merge pull request #278 from open-formulieren/fix/file-component

[OF#2335] Re-display drag&drop on cancel upload

src/formio/components/FileField.js

@@ -190,13 +190,19 @@ class FileField extends Formio.Components.components.file {
     return super.checkComponentValidity(data, dirty, row, options);
   }
 
+  abortUpload() {
+    // Formiojs bug #4555 - After deleting a file, if the drag&drop area had been hidden, it
+    // doesn't show after deleting.
+    this.fileDropHidden = false;
+  }
+
   deleteFile(fileInfo) {
     // Regression #1539 because of 77e99358a625a9f242f09aa6368a8b7b2c816e88 - failing
     // to pass the `url` prop/option to the Formio WebForm constructor leads to
     // `webform.setUrl` not being called, which leads to this.root.formio not being
     // defined. This codepath leaves vanilla Formio clueless about sending the
     // DELETE request, even though it can just use the global formio object...
-    // Instead of polluting our global configuratio with a non-sense URL (which also
+    // Instead of polluting our global configuration with a nonsense URL (which also
     // 'enables' saving drafts, for example), we opt to handle the delete call ourselves
     // in those cases.
     const formio = this.options.formio || (this.root && this.root.formio);