fix(language-service): CRLF offset in inline template (#34737)

This commit fixes incorrect CRLF offsets in inline template.

PR closes https://github.com/angular/vscode-ng-language-service/issues/520

PR Close #34737

packages/language-service/test/diagnostics_spec.ts

@@ -804,16 +804,15 @@ describe('diagnostics', () => {
     });
   });
 
-  it('should work correctly with CRLF endings', () => {
+  it('should work correctly with CRLF endings in external template', () => {
     // https://github.com/angular/vscode-ng-language-service/issues/235
     // In the example below, the string
     // `\r\n{{line0}}\r\n{{line1}}\r\n{{line2}}` is tokenized as a whole,
     // and then CRLF characters are converted to LF.
     // Source span information is lost in the process.
-    const fileName = '/app/test.ng';
-    const content =
-        mockHost.override(fileName, '\r\n<div>\r\n{{line0}}\r\n{{line1}}\r\n{{line2}}\r\n</div>');
-    const ngDiags = ngLS.getDiagnostics(fileName);
+    const content = mockHost.override(
+        TEST_TEMPLATE, '\r\n<div>\r\n{{line0}}\r\n{{line1}}\r\n{{line2}}\r\n</div>');
+    const ngDiags = ngLS.getDiagnostics(TEST_TEMPLATE);
     expect(ngDiags.length).toBe(3);
     for (let i = 0; i < 3; ++i) {
       const {messageText, start, length} = ngDiags[i];
@@ -828,6 +827,21 @@ describe('diagnostics', () => {
     }
   });
 
+  it('should work correctly with CRLF endings in inline template', () => {
+    const fileName = mockHost.addCode(
+        '\n@Component({template:`\r\n\r\n{{line}}`})export class ComponentCRLF {}');
+    const content = mockHost.readFile(fileName) !;
+    const ngDiags = ngLS.getDiagnostics(fileName);
+    expect(ngDiags.length).toBeGreaterThan(0);
+    const {messageText, start, length} = ngDiags[0];
+    expect(messageText)
+        .toBe(
+            `Identifier 'line' is not defined. ` +
+            `The component declaration, template variable declarations, and ` +
+            `element references do not contain such a member`);
+    expect(content.substring(start !, start ! + length !)).toBe('line');
+  });
+
   it('should not produce diagnostics for non-exported directives', () => {
     const fileName = '/app/test.component.ts';
     mockHost.addScript(fileName, `