Implement computeDryBaseline for RenderWrap (flutter#146260)

Author: LongCatIsLooong

packages/flutter/lib/src/rendering/table.dart

@@ -806,7 +806,8 @@ class RenderTable extends RenderBox {
   double? _baselineDistance;
   @override
   double? computeDistanceToActualBaseline(TextBaseline baseline) {
-    // returns the baseline of the first cell that has a baseline in the first row
+    // returns the baseline offset of the cell in the first row with
+    // the lowest baseline, and uses `TableCellVerticalAlignment.baseline`.
     assert(!debugNeedsLayout);
     return _baselineDistance;
   }
@@ -1026,6 +1027,36 @@ class RenderTable extends RenderBox {
     return Rect.fromLTRB(0.0, _rowTops[row], size.width, _rowTops[row + 1]);
   }
 
+  @override
+  double? computeDryBaseline(covariant BoxConstraints constraints, TextBaseline baseline) {
+    if (rows * columns == 0) {
+      return null;
+    }
+    final List<double> widths = _computeColumnWidths(constraints);
+    double? baselineOffset;
+    for (int col = 0; col < columns; col += 1) {
+      final RenderBox? child = _children[col];
+      final BoxConstraints childConstraints = BoxConstraints.tightFor(width: widths[col]);
+      if (child == null) {
+        continue;
+      }
+      final TableCellParentData childParentData = child.parentData! as TableCellParentData;
+      final double? childBaseline = switch (childParentData.verticalAlignment ?? defaultVerticalAlignment) {
+        TableCellVerticalAlignment.baseline => child.getDryBaseline(childConstraints, baseline),
+        TableCellVerticalAlignment.baseline ||
+        TableCellVerticalAlignment.top ||
+        TableCellVerticalAlignment.middle ||
+        TableCellVerticalAlignment.bottom ||
+        TableCellVerticalAlignment.fill ||
+        TableCellVerticalAlignment.intrinsicHeight => null,
+      };
+      if (childBaseline != null && (baselineOffset == null || baselineOffset < childBaseline)) {
+        baselineOffset = childBaseline;
+      }
+    }
+    return baselineOffset;
+  }
+
   @override
   @protected
   Size computeDryLayout(covariant BoxConstraints constraints) {