Support exponent notation for numbers with capital E for SVG parsing

DEVSIX-6645

Autoported commit.
Original commit hash: [f3771f179]

Author: yulian-gaponenko

itext.tests/itext.styledxmlparser.tests/itext/styledxmlparser/css/util/CssDimensionParsingUtilsTest.cs

@@ -157,21 +157,29 @@ public virtual void ParseAbsoluteLengthFromNull() {
         }
 
         [NUnit.Framework.Test]
-        public virtual void ParseAboluteLengthExponential01() {
+        public virtual void ParseAbsoluteLengthExponentialPtTest() {
             String value = "1e2pt";
             float actual = CssDimensionParsingUtils.ParseAbsoluteLength(value);
             float expected = 1e2f;
             NUnit.Framework.Assert.AreEqual(expected, actual, 0);
         }
 
         [NUnit.Framework.Test]
-        public virtual void ParseAboluteLengthExponential02() {
+        public virtual void ParseAbsoluteLengthExponentialPxTest() {
             String value = "1e2px";
             float actual = CssDimensionParsingUtils.ParseAbsoluteLength(value);
             float expected = 1e2f * 0.75f;
             NUnit.Framework.Assert.AreEqual(expected, actual, 0);
         }
 
+        [NUnit.Framework.Test]
+        public virtual void ParseAbsoluteLengthExponentialCapitalTest() {
+            String value = "1E-4";
+            float actual = CssDimensionParsingUtils.ParseAbsoluteLength(value);
+            float expected = 1e-4f * 0.75f;
+            NUnit.Framework.Assert.AreEqual(expected, actual, 1e-9);
+        }
+
         [NUnit.Framework.Test]
         public virtual void ParseAbsoluteLength12cmTest() {
             // Calculations in CssUtils#parseAbsoluteLength were changed to work

itext/itext.styledxmlparser/itext/styledxmlparser/css/util/CssDimensionParsingUtils.cs

@@ -488,7 +488,7 @@ private static bool IsDigit(char ch) {
         }
 
         private static bool IsExponentNotation(String s, int index) {
-            return index < s.Length && s[index] == 'e' && 
+            return index < s.Length && char.ToLower(s[index]) == 'e' && 
                         // e.g. 12e5
                         (index + 1 < s.Length && IsDigit(s[index + 1]) || 
                         // e.g. 12e-5, 12e+5

port-hash

@@ -1 +1 @@
-32c1b3194dfe5f5cae361b99d56dc72b5844b25e
+f3771f179d110abe0b9ef8e28d6283f93d849268