fix(43292): forbid highlighting multiline template strings (#46531)

src/services/findAllReferences.ts

@@ -2021,7 +2021,8 @@ namespace ts.FindAllReferences {
                             }
                         }
                         else {
-                            return nodeEntry(ref, EntryKind.StringLiteral);
+                            return isNoSubstitutionTemplateLiteral(ref) && !rangeIsOnSingleLine(ref, sourceFile) ? undefined :
+                                nodeEntry(ref, EntryKind.StringLiteral);
                         }
                     }
                 });

tests/cases/fourslash/documentHighlightMultilineTemplateStrings.ts

@@ -0,0 +1,10 @@
+/// <reference path='fourslash.ts'/>
+
+////const foo = `
+////    a
+////    [|b|]
+////    c
+////`
+
+const [r] = test.ranges();
+verify.noDocumentHighlights(r);

tests/cases/fourslash/documentHighlightTemplateStrings.ts

@@ -0,0 +1,18 @@
+/// <reference path='fourslash.ts'/>
+
+////type Foo = "[|a|]" | "b";
+////
+////class C {
+////   p: Foo = `[|a|]`;
+////   m() {
+////       switch (this.p) {
+////           case `[|a|]`:
+////               return 1;
+////           case "b":
+////               return 2;
+////       }
+////   }
+////}
+
+const [r0, r1, r2] = test.ranges();
+verify.documentHighlightsOf(r2, [r0, r1, r2]);