Handle CR+LF end of line sequences in the license parser (#40718)

packages/flutter/lib/src/foundation/licenses.dart

@@ -180,11 +180,16 @@ class LicenseEntryWithLineBreaks extends LicenseEntry {
               currentLineIndent += 8;
               state = _LicenseEntryWithLineBreaksParserState.beforeParagraph;
               break;
+            case '\r':
             case '\n':
             case '\f':
               if (lines.isNotEmpty) {
                 yield getParagraph();
               }
+              if (text[currentPosition] == '\r' && currentPosition < text.length - 1
+                  && text[currentPosition + 1] == '\n') {
+                currentPosition += 1;
+              }
               lastLineIndent = 0;
               currentLineIndent = 0;
               currentParagraphIndentation = null;

packages/flutter/test/foundation/licenses_test.dart

@@ -158,6 +158,7 @@ S
 
   test('LicenseEntryWithLineBreaks - leading and trailing whitespace', () {
     expect(const LicenseEntryWithLineBreaks(null, '    \n\n    ').paragraphs.toList(), isEmpty);
+    expect(const LicenseEntryWithLineBreaks(null, '    \r\n\r\n    ').paragraphs.toList(), isEmpty);
 
     List<LicenseParagraph> paragraphs;