Fix too many versions loaded

When scrolling quickly through the date selector, e.g. via switching the month quickly,
the asynchronous fetching could cause too many versions to be loaded

archive/archiveviewer.js

@@ -112,6 +112,11 @@ class ArchiveView {
                 )
             )
         ).then((commits) => {
+                // Skip if new date is selected
+                if (date != this.dateselector.value) {
+                    return 0;
+                }
+                
                 this.add_commits(commits)
                 return commits.length
             }