Replace grid track sizing algorithm with ported code from chromium

* Also implement 5th point from grid track sizing algroithm

DEVSIX-8387

Author: introfog

layout/src/main/java/com/itextpdf/layout/exceptions/LayoutExceptionMessageConstant.java

@@ -60,7 +60,9 @@ public final class LayoutExceptionMessageConstant {
     public static final String GRID_AUTO_REPEAT_CAN_BE_USED_ONLY_ONCE
             = "Automatic repetitions in the grid template are allowed only once per template.";
     public static final String GRID_AUTO_REPEAT_CANNOT_BE_COMBINED_WITH_INDEFINITE_SIZES
-            = "Automatic repetitions in the grid template  cannot be combined with intrinsic or flexible sizes.";
+            = "Automatic repetitions in the grid template cannot be combined with intrinsic or flexible sizes.";
+    public static final String FLEXIBLE_ARENT_ALLOWED_AS_MINIMUM_IN_MINMAX
+            = "Flexible values aren't allowed as minimum in minmax grid function.";
 
     private LayoutExceptionMessageConstant(){}
 }

layout/src/main/java/com/itextpdf/layout/renderer/GridContainerRenderer.java

@@ -345,10 +345,8 @@ private static Grid constructGrid(GridContainerRenderer renderer, Rectangle actu
         float rowGap = rowGapProp == null ? 0f : (float) rowGapProp;
 
         // Resolving repeats
-        GridTemplateResolver rowRepeatResolver
-                = new GridTemplateResolver(actualBBox.getHeight(), rowGap);
-        GridTemplateResolver columnRepeatResolver
-                = new GridTemplateResolver(actualBBox.getWidth(), columnGap);
+        GridTemplateResolver rowRepeatResolver = new GridTemplateResolver(actualBBox.getHeight(), rowGap);
+        GridTemplateResolver columnRepeatResolver = new GridTemplateResolver(actualBBox.getWidth(), columnGap);
         List<GridValue> templateRows = rowRepeatResolver.resolveTemplate(
                 renderer.<List<TemplateValue>>getProperty(Property.GRID_TEMPLATE_ROWS));
         List<GridValue> templateColumns = columnRepeatResolver.resolveTemplate(

layout/src/main/java/com/itextpdf/layout/renderer/GridSizer.java

@@ -24,7 +24,6 @@ This file is part of the iText (R) project.
 
 import com.itextpdf.kernel.geom.Rectangle;
 import com.itextpdf.layout.properties.grid.AutoValue;
-import com.itextpdf.layout.properties.grid.FlexValue;
 import com.itextpdf.layout.properties.grid.GridValue;
 import com.itextpdf.layout.renderer.Grid.GridOrder;
 import com.itextpdf.layout.renderer.GridTrackSizer.TrackSizingResult;
@@ -178,7 +177,7 @@ private void resolveGridColumns() {
             } else if (columnAutoWidth != null) {
                 colsValues.add(columnAutoWidth);
             } else {
-                colsValues.add(new FlexValue(1f));
+                colsValues.add(AutoValue.VALUE);
             }
         }
         GridTrackSizer gridTrackSizer = new GridTrackSizer(grid, colsValues, columnGap,

layout/src/main/java/com/itextpdf/layout/renderer/GridTemplateResolver.java

@@ -30,6 +30,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.layout.properties.grid.PercentValue;
 import com.itextpdf.layout.properties.grid.PointValue;
 import com.itextpdf.layout.properties.grid.TemplateValue;
+import com.itextpdf.layout.properties.grid.TemplateValue.ValueType;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -136,9 +137,15 @@ private float processValue(TemplateValue value) {
                 // or as its minimum track sizing function otherwise
                 // if encountered intrinsic or flexible before, then it doesn't matter what to process
                 boolean currentValue = containsIntrinsicOrFlexible;
-                float length = processValue(((MinMaxValue)value).getMax());
+                final MinMaxValue minMaxValue = (MinMaxValue) value;
+                if (minMaxValue.getMin().getType() == ValueType.FLEX) {
+                    // A future level of CSS Grid spec may allow <flex> minimums, but not now
+                    throw new IllegalStateException(
+                            LayoutExceptionMessageConstant.FLEXIBLE_ARENT_ALLOWED_AS_MINIMUM_IN_MINMAX);
+                }
+                float length = processValue(minMaxValue.getMax());
                 if (containsIntrinsicOrFlexible) {
-                    length = processValue(((MinMaxValue)value).getMin());
+                    length = processValue(minMaxValue.getMin());
                 }
                 containsIntrinsicOrFlexible = currentValue;
                 result.setFreeze(false);