Upload progress incorrect in Google Chrome (#1016)

Sometimes the browser doesn't has the correct file size onloadstart. like described here: #1002 (comment)

During debugging i have found out, that this bug is present in Chrome. In Chrome there is often a total wrong total size (see comment) and in Firefox there is sometime a little difference between the total size onloadstart and onprogress.

We should set file.size like in earlier versions also in onprogress event and check in progress event, if the upload is already complete.

ember-file-upload/src/system/upload.ts

@@ -92,13 +92,20 @@ export function upload(
     if (!evt.lengthComputable || evt.total === 0) return;
 
     file.loaded = evt.loaded;
-    file.size = evt.total;
+    // It occurs that the evt.total is not always correct.
+    // For this reason we should hold the max file size.
+    // The correct should be returned while progress
+    file.size = Math.max(file.size, evt.total);
     file.progress = (file.loaded / file.size) * 100;
   };
 
   request.onprogress = function (evt) {
     if (!evt) return;
-    if (!evt.lengthComputable || evt.total === 0) return;
+    // We need to check also for isUploadComplete, because the browsers brings sometimes the onprogress after onloadend event
+    if (!evt.lengthComputable || evt.total === 0 || file.isUploadComplete)
+      return;
+
+    file.size = evt.total;
 
     // When the progress is completed there is possible that we get the `Content-Length` response header of the upload endpoint as loaded / total.
     // There is possible that `Content-Length` is lower or higher than the already loaded bytes.
@@ -118,6 +125,7 @@ export function upload(
 
     file.loaded = file.size;
     file.progress = (file.loaded / file.size) * 100;
+    file.isUploadComplete = true;
   };
 
   request.ontimeout = () => {

ember-file-upload/src/upload-file.ts

@@ -88,6 +88,11 @@ export class UploadFile {
    */
   @tracked progress = 0;
 
+  /**
+   * When upload has finished this property will be set to true
+   */
+  @tracked isUploadComplete = false;
+
   /**
    * The current state that the file is in.
    */