Port remaining Acid2 min/max-height and table cross-checks

Rounds out the box-model (ch.8/10) and table (ch.17) spot-checks this
branch's plan originally called for: min-height/max-height precedence
(CSS2.1 §10.7, including the percentage-height-against-auto-height-
container edge case), table-cell height stretching to its row's
height even when the cell's own explicit height is shorter (§17.5.3),
and border-spacing:0 leaving no gap between adjacent cells. All pass
against the existing engine unmodified.

Chapter 11 (overflow/clip/visibility) and 13 (paged media) were
spot-checked against PeachPDF's fuller suites and found already
adequately covered for CSS 2.1 - PeachPDF's remaining
OverflowClipIntegrationTests cases are border-radius+stacking-context
specific (CSS3), and its paged-media margin-box/named-page tests are
CSS3 Paged Media/GCPM, both out of this sweep's CSS 2.1 scope.

Author: jhaygood86

Source/Test/HtmlRenderer.IntegrationTest/BoxModel/MinMaxHeightIntegrationTests.cs

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+using HtmlRenderer.IntegrationTest.TestSupport;
+
+namespace HtmlRenderer.IntegrationTest.BoxModel;
+
+/// <summary>
+/// Ported from PeachPDF.Tests' Acid2 min-height/max-height regression cases (CSS 2.1 §10.7).
+/// </summary>
+[DoNotParallelize]
+[TestClass]
+public sealed class MinMaxHeightIntegrationTests
+{
+    private const double Delta = 0.5;
+
+    [TestMethod]
+    public void MinHeightWinsOverConflictingMaxHeight()
+    {
+        // min-height (20px) and max-height (5px) conflict; min-height must win per §10.7, so the box's
+        // actual height must be 20px, not clamped down to 5px.
+        var html = LayoutHarness.Wrap("<div id='b' style='height:8px; min-height:20px; max-height:5px;'></div>");
+        var (root, _) = LayoutHarness.Layout(html);
+        var box = LayoutHarness.FindById(root, "b")!;
+
+        Assert.AreEqual(20, box.ActualBottom - box.Location.Y, Delta);
+    }
+
+    [TestMethod]
+    public void MaxHeightAppliesWhenNotConflictingWithMinHeight()
+    {
+        var html = LayoutHarness.Wrap("<div id='b' style='height:100px; max-height:20px;'></div>");
+        var (root, _) = LayoutHarness.Layout(html);
+        var box = LayoutHarness.FindById(root, "b")!;
+
+        Assert.AreEqual(20, box.ActualBottom - box.Location.Y, Delta);
+    }
+
+    [TestMethod]
+    public void PercentageHeight_AgainstAutoHeightContainingBlock_ResolvesToAuto_LettingMaxHeightWin()
+    {
+        // "height: 60%" must resolve to auto (zero intrinsic content) against an auto-height containing
+        // block (CSS 2.1 §10.5/§10.7), not against the container's own content-driven height - so
+        // max-height:20px is the only thing constraining #b's height.
+        var html = LayoutHarness.Wrap(
+            "<div id='cb'>"
+            + "<div id='content' style='height:50px;'></div>"
+            + "<div id='b' style='height:60%; max-height:20px;'></div>"
+            + "</div>");
+        var (root, _) = LayoutHarness.Layout(html);
+        var box = LayoutHarness.FindById(root, "b")!;
+
+        var height = box.ActualBottom - box.Location.Y;
+        Assert.IsTrue(height is >= 0 and <= 20.5, $"expected height clamped to max-height:20px, was {height}");
+    }
+}

Source/Test/HtmlRenderer.IntegrationTest/Tables/Acid2TableIntegrationTests.cs

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+using HtmlRenderer.IntegrationTest.TestSupport;
+
+namespace HtmlRenderer.IntegrationTest.Tables;
+
+/// <summary>
+/// Ported from PeachPDF.Tests' Acid2 table regression cases (CSS 2.1 §17.5.3 row-stretch, §17.6.1
+/// border-spacing).
+/// </summary>
+[DoNotParallelize]
+[TestClass]
+public sealed class Acid2TableIntegrationTests
+{
+    private const double Delta = 0.5;
+
+    [TestMethod]
+    public void TableCell_ExplicitHeightShorterThanRow_StretchesToRowHeight()
+    {
+        var html = LayoutHarness.Wrap(
+            "<table><tr>"
+            + "<td id='tall' style='height:40px;'></td>"
+            + "<td id='short' style='height:5px;'></td>"
+            + "</tr></table>");
+        var (root, _) = LayoutHarness.Layout(html);
+
+        var tall = LayoutHarness.FindById(root, "tall")!;
+        var shortCell = LayoutHarness.FindById(root, "short")!;
+
+        Assert.AreEqual(tall.ActualBottom, shortCell.ActualBottom, Delta);
+    }
+
+    [TestMethod]
+    public void BorderSpacingZero_AdjacentCells_HaveNoGapBetweenThem()
+    {
+        var html = LayoutHarness.Wrap(
+            "<table style='border-spacing:0;'><tr>"
+            + "<td id='c1' style='width:20px;'>a</td>"
+            + "<td id='c2' style='width:20px;'>b</td>"
+            + "</tr></table>");
+        var (root, _) = LayoutHarness.Layout(html);
+
+        var c1 = LayoutHarness.FindById(root, "c1")!;
+        var c2 = LayoutHarness.FindById(root, "c2")!;
+
+        Assert.AreEqual(c1.ActualRight, c2.Location.X, Delta);
+    }
+}