Respect flex item's height calculated during the algo

It should be set as min-height as well, so that
the element's height is extended if needed

DEVSIX-5178

Author: ars18wrw

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

@@ -89,18 +89,25 @@ public LayoutResult layout(LayoutContext layoutContext) {
         lines = FlexUtil.calculateChildrenRectangles(layoutContextRectangle, this);
         final List<UnitValue> previousWidths = new ArrayList<>();
         final List<UnitValue> previousHeights = new ArrayList<>();
+        final List<UnitValue> previousMinHeights = new ArrayList<>();
         for (final List<FlexItemInfo> line : lines) {
             for (final FlexItemInfo itemInfo : line) {
                 final Rectangle rectangleWithoutBordersMarginsPaddings =
                         itemInfo.getRenderer().applyMarginsBordersPaddings(itemInfo.getRectangle().clone(), false);
 
                 previousWidths.add(itemInfo.getRenderer().<UnitValue>getProperty(Property.WIDTH));
                 previousHeights.add(itemInfo.getRenderer().<UnitValue>getProperty(Property.HEIGHT));
+                previousMinHeights.add(itemInfo.getRenderer().<UnitValue>getProperty(Property.MIN_HEIGHT));
 
                 itemInfo.getRenderer().setProperty(Property.WIDTH,
                         UnitValue.createPointValue(rectangleWithoutBordersMarginsPaddings.getWidth()));
                 itemInfo.getRenderer().setProperty(Property.HEIGHT,
                         UnitValue.createPointValue(rectangleWithoutBordersMarginsPaddings.getHeight()));
+                // TODO DEVSIX-1895 Once the ticket is closed, there will be no need in setting min-height
+                // In case element takes less vertical space than expected, we need to make sure
+                // it is extended to the height predicted by the algo
+                itemInfo.getRenderer().setProperty(Property.MIN_HEIGHT,
+                        UnitValue.createPointValue(rectangleWithoutBordersMarginsPaddings.getHeight()));
             }
         }
         final LayoutResult result = super.layout(layoutContext);
@@ -113,6 +120,7 @@ public LayoutResult layout(LayoutContext layoutContext) {
             for (final FlexItemInfo itemInfo : line) {
                 itemInfo.getRenderer().setProperty(Property.WIDTH, previousWidths.get(counter));
                 itemInfo.getRenderer().setProperty(Property.HEIGHT, previousHeights.get(counter));
+                itemInfo.getRenderer().setProperty(Property.MIN_HEIGHT, previousMinHeights.get(counter));
                 ++counter;
             }
         }