Cancel media uploads when closing ComposeActivity #838 (#1189)

* Cancel media uploads on remove the draft message

* Fix formatting

app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java

@@ -1539,13 +1539,21 @@ public final class ComposeActivity
             new AlertDialog.Builder(this)
                     .setMessage(R.string.compose_save_draft)
                     .setPositiveButton(R.string.action_save, (d, w) -> saveDraftAndFinish())
-                    .setNegativeButton(R.string.action_delete, (d, w) -> finishWithoutSlideOutAnimation())
+                    .setNegativeButton(R.string.action_delete, (d, w) -> deleteDraftAndFinish())
                     .show();
         } else {
             finishWithoutSlideOutAnimation();
         }
     }
 
+    private void deleteDraftAndFinish() {
+        for (QueuedMedia media : mediaQueued) {
+            if (media.uploadRequest != null)
+                media.uploadRequest.cancel();
+        }
+        finishWithoutSlideOutAnimation();
+    }
+
     private void saveDraftAndFinish() {
         ArrayList<String> mediaUris = new ArrayList<>();
         ArrayList<String> mediaDescriptions = new ArrayList<>();