Fix double mapping issue for PdfType0Font

DEVSIX-8042

Author: vitali-pr

kernel/src/main/java/com/itextpdf/kernel/font/PdfType0Font.java

@@ -164,7 +164,7 @@ public class PdfType0Font extends PdfFont {
             embeddedToUnicode = toUnicodeCMap;
         }
 
-        if (cmap.isName() && (PdfEncodings.IDENTITY_H.equals(((PdfName) cmap).getValue()) ||
+        if (cmap.isName() && ((toUnicodeCMap != null) || PdfEncodings.IDENTITY_H.equals(((PdfName) cmap).getValue()) ||
                 PdfEncodings.IDENTITY_V.equals(((PdfName) cmap).getValue()))) {
 
             if (toUnicodeCMap == null) {

kernel/src/test/java/com/itextpdf/kernel/pdf/canvas/parser/PdfTextExtractorTest.java

@@ -151,4 +151,14 @@ public void notDefaultCodespacesChineseTest() throws IOException {
             Assert.assertTrue(extractedText.contains("L3B 廠： 新竹科學工業園區新竹市東區力行二路 1 號"));
         }
     }
+
+    @Test
+    public void mixedCharacterCodes() throws IOException {
+        String inFile = sourceFolder + "SameCidForDifferentCodes.pdf";
+        try (PdfDocument pdfDocument = new PdfDocument(new PdfReader(inFile))) {
+            String extractedText = PdfTextExtractor.getTextFromPage(pdfDocument.getPage(1));
+            Assert.assertTrue(extractedText.contains("18个月"));
+            Assert.assertFalse(extractedText.contains("18个⽉"));
+        }
+    }
 }