fix(test): fix FileFilters exclude test race condition in Firefox

The awaitsFor loop only checked that CSS results were absent but did not
wait for HTML results to be populated. In Firefox on CI the search can
remove CSS matches before finishing HTML indexing, causing the subsequent
expect to see undefined. Add the positive HTML check to both awaitsFor
conditions, matching the pattern already used in the filter-switching test.

Author: abose

test/spec/FileFilters-integ-test.js

@@ -214,7 +214,8 @@ define(function (require, exports, module) {
                 await openSearchBar();
                 await awaitsFor(async ()=>{
                     await executeCleanSearch("{1}");
-                    return !FindInFiles.searchModel.results[testPath + "/test1.css"];
+                    return !FindInFiles.searchModel.results[testPath + "/test1.css"] &&
+                        !!FindInFiles.searchModel.results[testPath + "/test1.html"];
                     // retry as instant/deferred searches can race with the explicit search
                 }, "Search to exclude css results", 7000, 300);
                 // *.css should have been excluded this time
@@ -329,7 +330,8 @@ define(function (require, exports, module) {
                 _setExcludeFiles("*.css");
                 await awaitsFor(async ()=>{
                     await executeCleanSearch("{1}");
-                    return !FindInFiles.searchModel.results[testPath + "/test1.css"];
+                    return !FindInFiles.searchModel.results[testPath + "/test1.css"] &&
+                        !!FindInFiles.searchModel.results[testPath + "/test1.html"];
                     // retry as instant/deferred searches can race with the explicit search
                 }, "Search to exclude css results", 7000, 300);
                 expect(FindInFiles.searchModel.results[testPath + "/test1.css"]).toBeFalsy();