Customize saving state, so that q and Q operators are not drawn inside text blocks

Changes were cherry picked from 7.2 develop branch (see DEVSIX-5427 ticket)

DEVSIX-6938

Autoported commit.
Original commit hash: [2027c666e]

Author: introfog

itext.tests/itext.svg.tests/itext/svg/renderers/impl/TSpanNodeRendererIntegrationTest.cs

@@ -212,5 +212,20 @@ public virtual void TspanInheritTextFontSizeTest() {
         public virtual void TspanInheritAncestorsTspanFontSizeTest() {
             ConvertAndCompareSinglePage(SOURCE_FOLDER, DESTINATION_FOLDER, "tspanInheritAncestorsTspanFontSize");
         }
+
+        [NUnit.Framework.Test]
+        public virtual void TspanNestedWithOffsets() {
+            ConvertAndCompareSinglePage(SOURCE_FOLDER, DESTINATION_FOLDER, "tspanNestedWithOffsets");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void TspanNestedRelativeOffsets() {
+            ConvertAndCompareSinglePage(SOURCE_FOLDER, DESTINATION_FOLDER, "tspanNestedRelativeOffsets");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void SimpleNestedTspanTest() {
+            ConvertAndCompareSinglePage(SOURCE_FOLDER, DESTINATION_FOLDER, "simpleNestedTspan");
+        }
     }
 }