Add negative indexes support in grid layout

DEVSIX-8423

Autoported commit.
Original commit hash: [9ec3a26d1]

Author: Dmitry Radchuk

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/grid/GridItemPlacementTest.cs

@@ -148,28 +148,63 @@ public virtual void TwoRowSpans3Test() {
         }
 
         [NUnit.Framework.Test]
-        public virtual void Invalid1Test() {
-            RunTest("invalid1");
+        public virtual void SpanToNegativeStartTest() {
+            RunTest("spanToNegativeStartTest");
         }
 
         [NUnit.Framework.Test]
-        public virtual void Invalid2Test() {
-            RunTest("invalid2");
+        public virtual void SpanToNegativeStartWithExplicitTemplatesTest() {
+            RunTest("spanToNegativeStartWithExplicitTemplatesTest");
         }
 
         [NUnit.Framework.Test]
-        public virtual void Invalid3Test() {
-            RunTest("invalid3");
+        public virtual void SpanToNegativeStartWithoutTemplatesTest() {
+            RunTest("spanToNegativeStartWithoutTemplatesTest");
         }
 
         [NUnit.Framework.Test]
-        public virtual void Invalid4Test() {
-            RunTest("invalid4");
+        public virtual void SpanToNegativeStartWithoutTemplatesTest2() {
+            RunTest("spanToNegativeStartWithoutTemplatesTest2");
         }
 
         [NUnit.Framework.Test]
-        public virtual void Invalid5Test() {
-            RunTest("invalid5");
+        public virtual void SpanToNegativeStartWithSingleTemplateTest() {
+            RunTest("spanToNegativeStartWithSingleTemplateTest");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void ColumnSpanExpandsStartToNegativeTest() {
+            RunTest("columnSpanExpandsStartToNegativeTest");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void NegativeIndexOutOfTemplateTest() {
+            RunTest("negativeIndexOutOfTemplateTest");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void NegativeIndexWithImplicitLinesTest() {
+            RunTest("negativeIndexWithImplicitLinesTest");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void NegativeIndexWithoutTemplateTest() {
+            RunTest("negativeIndexWithoutTemplateTest");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void NegativeIndexShorthandTest() {
+            RunTest("negativeIndexShorthandTest");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void NegativeAndPositiveIndexShorthandTest() {
+            RunTest("negativeAndPositiveIndexShorthandTest");
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void SpanToNegativeIndexWithoutTemplateTest() {
+            RunTest("spanToNegativeIndexWithoutTemplateTest");
         }
 
         [NUnit.Framework.Test]

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/grid/GridTemplateColumnTest.cs

@@ -137,6 +137,11 @@ public virtual void TemplateColumnBasicTest2() {
             RunTest("template-cols-without-other-props-2");
         }
 
+        [NUnit.Framework.Test]
+        public virtual void TemplateColumnWithFlexAndGapsTest() {
+            RunTest("template-cols-with-flex-and-gaps");
+        }
+
         private void RunTest(String testName) {
             ConvertToPdfAndCompare(testName, SOURCE_FOLDER, DESTINATION_FOLDER, false, new ConverterProperties().SetBaseUri
                 (SOURCE_FOLDER));

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/grid/GridTemplateNestedTest.cs

@@ -22,7 +22,6 @@ You should have received a copy of the GNU Affero General Public License
 */
 using System;
 using iText.Html2pdf;
-using iText.Test.Attributes;
 
 namespace iText.Html2pdf.Css.Grid {
     [NUnit.Framework.Category("IntegrationTest")]
@@ -48,7 +47,6 @@ public virtual void TemplateNestedAreasWithBorderTest() {
             RunTest("grid-nested-areas-with-border");
         }
 
-        [NUnit.Framework.Ignore("DEVSIX-8423")]
         [NUnit.Framework.Test]
         public virtual void TemplateNestedArticlesTest() {
             RunTest("grid-nested-articles");
@@ -79,7 +77,6 @@ public virtual void TemplateNestedMixedContentTest() {
             RunTest("grid-nested-mixed-content");
         }
 
-        [NUnit.Framework.Ignore("DEVSIX-8423")]
         [NUnit.Framework.Test]
         public virtual void TemplateNestedParagraphsTest() {
             RunTest("grid-nested-paragraphs");
@@ -105,26 +102,21 @@ public virtual void TemplateNestedTableMixedContentTest() {
             RunTest("grid-nested-table-with-mixed-content");
         }
 
-        [NUnit.Framework.Ignore("DEVSIX-8423")]
         [NUnit.Framework.Test]
         public virtual void TemplateNested2LevelsWithAreasTest() {
             RunTest("grid-nested-2-levels-areas");
         }
 
-        [NUnit.Framework.Ignore("DEVSIX-8423")]
-        [LogMessage(iText.IO.Logs.IoLogMessageConstant.CLIP_ELEMENT, Count = 4)]
         [NUnit.Framework.Test]
         public virtual void TemplateNested3LevelsFormsTest() {
             RunTest("grid-nested-3-forms");
         }
 
-        [NUnit.Framework.Ignore("DEVSIX-8423")]
         [NUnit.Framework.Test]
         public virtual void TemplateNested3LevelsTest() {
             RunTest("grid-nested-3-levels");
         }
 
-        [NUnit.Framework.Ignore("DEVSIX-8423")]
         [NUnit.Framework.Test]
         public virtual void TemplateNested3LevelsMultipleTest() {
             RunTest("grid-nested-3-levels-multiple");

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/grid/GridTemplatesTest.cs

@@ -131,6 +131,11 @@ public virtual void BasicColumnRowStartEndTest() {
             RunTest("basicColumnRowStartEndTest");
         }
 
+        [NUnit.Framework.Test]
+        public virtual void BasicColumnRowStartEnd1Test() {
+            RunTest("basicColumnRowStartEnd1Test");
+        }
+
         [NUnit.Framework.Test]
         public virtual void BasicColumnRowStartEnd2Test() {
             RunTest("basicColumnRowStartEnd2Test");

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/w3c/css_grid/abspos/GridPaintPositionedChildren001Test.cs

@@ -24,7 +24,6 @@ You should have received a copy of the GNU Affero General Public License
 using iText.Html2pdf.Css.W3c;
 
 namespace iText.Html2pdf.Css.W3c.Css_grid.Abspos {
-    [NUnit.Framework.Ignore("DEVSIX-8423")]
     public class GridPaintPositionedChildren001Test : W3CCssTest {
         protected internal override String GetHtmlFileName() {
             return "grid-paint-positioned-children-001.html";

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/w3c/css_grid/abspos/PositionedGridItems025Test.cs

@@ -25,7 +25,6 @@ You should have received a copy of the GNU Affero General Public License
 using iText.Test.Attributes;
 
 namespace iText.Html2pdf.Css.W3c.Css_grid.Abspos {
-    [NUnit.Framework.Ignore("DEVSIX-8423")]
     [LogMessage(iText.IO.Logs.IoLogMessageConstant.OCCUPIED_AREA_HAS_NOT_BEEN_INITIALIZED, Count = 2)]
     public class PositionedGridItems025Test : W3CCssTest {
         protected internal override String GetHtmlFileName() {

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/w3c/css_grid/abspos/PositionedGridItemsNegativeIndices001Test.cs

@@ -24,7 +24,6 @@ You should have received a copy of the GNU Affero General Public License
 using iText.Html2pdf.Css.W3c;
 
 namespace iText.Html2pdf.Css.W3c.Css_grid.Abspos {
-    [NUnit.Framework.Ignore("DEVSIX-8423")]
     public class PositionedGridItemsNegativeIndices001Test : W3CCssTest {
         protected internal override String GetHtmlFileName() {
             return "positioned-grid-items-negative-indices-001.html";

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/w3c/css_grid/grid_definition/GridAutoRepeatMaxSize002Test.cs

@@ -26,7 +26,6 @@ You should have received a copy of the GNU Affero General Public License
 using iText.Test.Attributes;
 
 namespace iText.Html2pdf.Css.W3c.Css_grid.Grid_definition {
-    [NUnit.Framework.Ignore("DEVSIX-8423")]
     [LogMessage(Html2PdfLogMessageConstant.NO_WORKER_FOUND_FOR_TAG, Count = 3)]
     public class GridAutoRepeatMaxSize002Test : W3CCssTest {
         protected internal override String GetHtmlFileName() {

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/w3c/css_grid/grid_definition/GridAutoRepeatMinMaxSize001Test.cs

@@ -26,7 +26,6 @@ You should have received a copy of the GNU Affero General Public License
 using iText.Test.Attributes;
 
 namespace iText.Html2pdf.Css.W3c.Css_grid.Grid_definition {
-    [NUnit.Framework.Ignore("DEVSIX-8423")]
     [LogMessage(Html2PdfLogMessageConstant.NO_WORKER_FOUND_FOR_TAG, Count = 3)]
     public class GridAutoRepeatMinMaxSize001Test : W3CCssTest {
         protected internal override String GetHtmlFileName() {

itext.tests/itext.html2pdf.tests/itext/html2pdf/css/w3c/css_grid/grid_definition/GridAutoRepeatMinSize001Test.cs

@@ -26,7 +26,6 @@ You should have received a copy of the GNU Affero General Public License
 using iText.Test.Attributes;
 
 namespace iText.Html2pdf.Css.W3c.Css_grid.Grid_definition {
-    [NUnit.Framework.Ignore("DEVSIX-8423")]
     [LogMessage(Html2PdfLogMessageConstant.NO_WORKER_FOUND_FOR_TAG, Count = 3)]
     public class GridAutoRepeatMinSize001Test : W3CCssTest {
         protected internal override String GetHtmlFileName() {