Add new tests for floats splitting edgecases

DEVSIX-1267

Autoported commit.
Original commit hash: [a30b527d4]

Author: yulian-gaponenko

itext.tests/itext.layout.tests/itext/layout/FloatTest.cs

@@ -142,7 +142,6 @@ public override LayoutResult Layout(LayoutContext layoutContext) {
                 LayoutResult result;
                 childRenderer.SetParent(this);
                 MarginsCollapseInfo childMarginsInfo = null;
-                // TODO process correctly for floats with clear
                 if (!waitingOverflowFloatRenderers.IsEmpty() && FloatingHelper.IsClearanceApplied(waitingOverflowFloatRenderers
                     , childRenderer.GetProperty<ClearPropertyValue?>(Property.CLEAR))) {
                     if (marginsCollapsingEnabled && !isCellRenderer) {
@@ -394,7 +393,6 @@ public override LayoutResult Layout(LayoutContext layoutContext) {
             ApplyVerticalAlignment();
             FloatingHelper.RemoveFloatsAboveRendererBottom(floatRendererAreas, this);
             if (!waitingOverflowFloatRenderers.IsEmpty()) {
-                // TODO what if overflow renderer is not null already?
                 overflowRenderer_1 = CreateOverflowRenderer(LayoutResult.PARTIAL);
                 overflowRenderer_1.GetChildRenderers().AddAll(waitingOverflowFloatRenderers);
             }