Do not substitute a symbol with itself during line transformations.

DEVSIX-2146

Author: ars18wrw

io/src/main/java/com/itextpdf/io/font/otf/GsubLookupType1.java

@@ -71,7 +71,7 @@ public boolean transformOne(GlyphLine line) {
         boolean changed = false;
         if (!openReader.isSkip(g.getCode(), lookupFlag)) {
             int substCode = substMap.get(g.getCode());
-            if (substCode != 0) {
+            if (substCode != 0 && substCode != g.getCode()) { // there is no need to substitute a symbol with itself
                 line.substituteOneToOne(openReader, substCode);
                 changed = true;
             }

io/src/main/java/com/itextpdf/io/font/otf/GsubLookupType3.java

@@ -71,7 +71,7 @@ public boolean transformOne(GlyphLine line) {
         boolean changed = false;
         if (!openReader.isSkip(g.getCode(), lookupFlag)) {
             int[] substCode = substMap.get(g.getCode());
-            if (substCode != null) {
+            if (substCode != null && substCode[0] != g.getCode()) { // there is no need to substitute a symbol with itself
                 line.substituteOneToOne(openReader, substCode[0]);
                 changed = true;
             }