Add safe-guard check if occupiedArea is initialized in renderers #move method

DEVSIX-6760

Autoported commit.
Original commit hash: [ee879e0bf]

Author: Alexander Kozlov

itext.tests/itext.layout.tests/itext/layout/FixedHeightTest.cs

@@ -0,0 +1,75 @@
+using System;
+using iText.Kernel.Colors;
+using iText.Kernel.Pdf;
+using iText.Kernel.Utils;
+using iText.Layout.Borders;
+using iText.Layout.Element;
+using iText.Test;
+using iText.Test.Attributes;
+
+namespace iText.Layout {
+    public class FixedHeightTest : ExtendedITextTest {
+        private static readonly String sourceFolder = iText.Test.TestUtil.GetParentProjectDirectory(NUnit.Framework.TestContext
+            .CurrentContext.TestDirectory) + "/resources/itext/layout/FloatAndAlignmentTest/";
+
+        private static readonly String destinationFolder = NUnit.Framework.TestContext.CurrentContext.TestDirectory
+             + "/test/itext/layout/FloatAndAlignmentTest/";
+
+        private const String textByron = "When a man hath no freedom to fight for at home,\n" + "    Let him combat for that of his neighbours;\n"
+             + "Let him think of the glories of Greece and of Rome,\n" + "    And get knocked on the head for his labours.\n"
+             + "\n" + "To do good to Mankind is the chivalrous plan,\n" + "    And is always as nobly requited;\n"
+             + "Then battle for Freedom wherever you can,\n" + "    And, if not shot or hanged, you'll get knighted.";
+
+        [NUnit.Framework.OneTimeSetUp]
+        public static void BeforeClass() {
+            CreateOrClearDestinationFolder(destinationFolder);
+        }
+
+        [LogMessage(iText.IO.Logs.IoLogMessageConstant.CLIP_ELEMENT, Count = 1)]
+        // TODO DEVSIX-1977 partial layout result due to fixed height should not contain not layouted kids
+        [LogMessage(iText.IO.Logs.IoLogMessageConstant.OCCUPIED_AREA_HAS_NOT_BEEN_INITIALIZED, Count = 6)]
+        [NUnit.Framework.Test]
+        public virtual void DivWithParagraphsAndFixedPositionTest() {
+            String outFileName = destinationFolder + "blockWithLimitedHeightAndFixedPositionTest.pdf";
+            String cmpFileName = sourceFolder + "cmp_blockWithLimitedHeightAndFixedPositionTest.pdf";
+            PdfDocument pdfDocument = new PdfDocument(new PdfWriter(outFileName));
+            Document doc = new Document(pdfDocument);
+            Div block = new Div();
+            block.SetBorder(new SolidBorder(ColorConstants.BLUE, 1));
+            block.SetHeight(120);
+            foreach (String line in iText.Commons.Utils.StringUtil.Split(textByron, "\n")) {
+                Paragraph p = new Paragraph();
+                p.Add(new Text(line));
+                p.SetBorder(new SolidBorder(0.5f));
+                block.Add(p);
+            }
+            block.SetFixedPosition(100, 600, 300);
+            doc.Add(block);
+            doc.Close();
+            NUnit.Framework.Assert.IsNull(new CompareTool().CompareByContent(outFileName, cmpFileName, destinationFolder
+                ));
+        }
+
+        [LogMessage(iText.IO.Logs.IoLogMessageConstant.CLIP_ELEMENT, Count = 1)]
+        // TODO DEVSIX-1977 partial layout result due to fixed height should not contain not layouted kids
+        [LogMessage(iText.IO.Logs.IoLogMessageConstant.OCCUPIED_AREA_HAS_NOT_BEEN_INITIALIZED, Count = 2)]
+        [NUnit.Framework.Test]
+        public virtual void ListWithFixedPositionTest() {
+            String outFileName = destinationFolder + "listWithFixedPositionTest.pdf";
+            String cmpFileName = sourceFolder + "cmp_listWithFixedPositionTest.pdf";
+            PdfDocument pdfDocument = new PdfDocument(new PdfWriter(outFileName));
+            Document doc = new Document(pdfDocument);
+            List list = new List();
+            list.SetBorder(new SolidBorder(ColorConstants.BLUE, 1));
+            list.SetHeight(120);
+            foreach (String line in iText.Commons.Utils.StringUtil.Split(textByron, "\n")) {
+                list.Add(line);
+            }
+            list.SetFixedPosition(100, 600, 300);
+            doc.Add(list);
+            doc.Close();
+            NUnit.Framework.Assert.IsNull(new CompareTool().CompareByContent(outFileName, cmpFileName, destinationFolder
+                ));
+        }
+    }
+}

itext.tests/itext.layout.tests/resources/itext/layout/FloatAndAlignmentTest/cmp_blockWithLimitedHeightAndFixedPositionTest.pdf

@@ -1068,6 +1068,12 @@ public virtual IRenderer GetParent() {
 
         /// <summary><inheritDoc/></summary>
         public virtual void Move(float dxRight, float dyUp) {
+            ILogger logger = ITextLogManager.GetLogger(typeof(iText.Layout.Renderer.AbstractRenderer));
+            if (occupiedArea == null) {
+                logger.LogError(MessageFormatUtil.Format(iText.IO.Logs.IoLogMessageConstant.OCCUPIED_AREA_HAS_NOT_BEEN_INITIALIZED
+                    , "Moving won't be performed."));
+                return;
+            }
             occupiedArea.GetBBox().MoveRight(dxRight);
             occupiedArea.GetBBox().MoveUp(dyUp);
             foreach (IRenderer childRenderer in childRenderers) {

itext.tests/itext.layout.tests/resources/itext/layout/FloatAndAlignmentTest/cmp_listWithFixedPositionTest.pdf

@@ -532,6 +532,12 @@ public override void DrawChildren(DrawContext drawContext) {
 
         /// <summary><inheritDoc/></summary>
         public override void Move(float dxRight, float dyUp) {
+            ILogger logger = ITextLogManager.GetLogger(typeof(iText.Layout.Renderer.ParagraphRenderer));
+            if (occupiedArea == null) {
+                logger.LogError(MessageFormatUtil.Format(iText.IO.Logs.IoLogMessageConstant.OCCUPIED_AREA_HAS_NOT_BEEN_INITIALIZED
+                    , "Moving won't be performed."));
+                return;
+            }
             occupiedArea.GetBBox().MoveRight(dxRight);
             occupiedArea.GetBBox().MoveUp(dyUp);
             if (null != lines) {

itext/itext.layout/itext/layout/renderer/AbstractRenderer.cs

@@ -1 +1 @@
-9f7192e712c44cdf2ec82ec88dc5c58da5942036
+ee879e0bf2b0ca201f39060bba59ce79e52ec62f