Fix the issue with applying justify align

DEVSIX-2992

Autoported commit.
Original commit hash: [c2b3f987d]

Author: vitali-pr

itext.tests/itext.layout.tests/itext/layout/AlignmentTest.cs

@@ -45,6 +45,9 @@ public class AlignmentTest : ExtendedITextTest {
         private static readonly String DESTINATION_FOLDER = NUnit.Framework.TestContext.CurrentContext.TestDirectory
              + "/test/itext/layout/AlignmentTest/";
 
+        private static readonly String FONTS_FOLDER = iText.Test.TestUtil.GetParentProjectDirectory(NUnit.Framework.TestContext
+            .CurrentContext.TestDirectory) + "/resources/itext/layout/fonts/";
+
         [NUnit.Framework.OneTimeSetUp]
         public static void BeforeClass() {
             CreateOrClearDestinationFolder(DESTINATION_FOLDER);
@@ -519,6 +522,23 @@ public virtual void FlexItemHorizontalAlignmentTest() {
                 , "diff"));
         }
 
+        [NUnit.Framework.Test]
+        public virtual void JustifiedAlignmentWithZeroFreeSpaceTest() {
+            String outFileName = DESTINATION_FOLDER + "justifiedAlignmentWithZeroFreeSpaceTest.pdf";
+            String cmpFileName = SOURCE_FOLDER + "cmp_justifiedAlignmentWithZeroFreeSpaceTest.pdf";
+            using (PdfDocument pdfDoc = new PdfDocument(new PdfWriter(outFileName))) {
+                Document document = new Document(pdfDoc);
+                PdfFont font = PdfFontFactory.CreateFont(FONTS_FOLDER + "NotoSansCJKjp-Regular.otf");
+                Text t1 = new Text("期期期").SetFont(font);
+                Text t2 = new Text("期期期").SetFont(font);
+                Paragraph p = new Paragraph(t1).Add(t2).SetSpacingRatio(1).SetWidth(60).SetTextAlignment(TextAlignment.JUSTIFIED
+                    );
+                document.Add(p);
+            }
+            NUnit.Framework.Assert.IsNull(new CompareTool().CompareByContent(outFileName, cmpFileName, DESTINATION_FOLDER
+                , "diff"));
+        }
+
         private static void CreateDocumentWithInlineAlignment(String outPdf, String cmpPdf, InlineVerticalAlignmentType?
              verticalAlignment1) {
             CreateDocumentWithInlineAlignment(outPdf, cmpPdf, verticalAlignment1, null);

itext.tests/itext.layout.tests/resources/itext/layout/AlignmentTest/cmp_justifiedAlignmentWithZeroFreeSpaceTest.pdf

@@ -729,7 +729,7 @@ public virtual void Justify(float width) {
             int baseCharsCount = BaseCharactersCount();
             float baseFactor = freeWidth / (ratio * numberOfSpaces + (1 - ratio) * (baseCharsCount - 1));
             //Prevent a NaN when trying to justify a single word with spacing_ratio == 1.0
-            if (float.IsInfinity(baseFactor)) {
+            if (float.IsInfinity(baseFactor) || float.IsNaN(baseFactor)) {
                 baseFactor = 0;
             }
             float wordSpacing = ratio * baseFactor;

itext/itext.layout/itext/layout/renderer/LineRenderer.cs

@@ -1 +1 @@
-a390afa1f077eb736e61e6d66d74a7f35354e0e4
+c2b3f987d05db32411585f4579adcef01ad857a3