Reset scroll fade when filtering

ee/app/assets/javascripts/boards/components/boards_selector.vue

@@ -113,6 +113,10 @@ export default {
     },
   },
   watch: {
+    filteredBoards() {
+      this.scrollFadeInitialized = false;
+      this.$nextTick(this.setScrollFade);
+    },
     reload() {
       if (this.reload) {
         this.boards = [];

ee/spec/javascripts/boards/components/boards_selector_spec.js

@@ -92,6 +92,7 @@ describe('BoardsSelector', () => {
   });
 
   it('shows the scroll fade if isScrolledUp', done => {
+    vm.scrollFadeInitialized = false;
     scrollContainer.scrollTop = 0;
 
     waitForScroll()