Verify that completion with new identifier location returns isNewIdentifierLocation: true

Fixes #24009

Signed-off-by: Sheetal Nandi <[email protected]>

Author: sheetalkamat

completionAtDottedNamespace.ts

@@ -0,0 +1,5 @@
+/// <reference path='fourslash.ts'/>
+
+////namespace wwer./**/w
+
+verify.completions({ marker: "", exact: [], isNewIdentifierLocation: true });

src/services/completions.ts

@@ -104,7 +104,7 @@ namespace ts.Completions {
             getJSCompletionEntries(sourceFile, location!.pos, uniqueNames, compilerOptions.target!, entries); // TODO: GH#18217
         }
         else {
-            if ((!symbols || symbols.length === 0) && keywordFilters === KeywordCompletionFilters.None) {
+            if (!isNewIdentifierLocation && (!symbols || symbols.length === 0) && keywordFilters === KeywordCompletionFilters.None) {
                 return undefined;
             }