GridView Fixes:

* Fix SizeFit applicability checks were incorrect.
* Fix GridView LayoutModel not accounting for margin and padding.

Author: SaadArdati

lib/src/api/nodes/grid_view_node.dart

@@ -84,7 +84,7 @@ class GridViewNode extends SinglePlaceholderNode
 
   /// Calculates the fixed main axis extent of any child in the grid.
   double calculateMainAxisExtent(
-    AxisC axis,
+    AxisC mainAxis,
     SizeC size, [
     double? crossAxisExtent,
   ]) {
@@ -99,10 +99,10 @@ class GridViewNode extends SinglePlaceholderNode
   }
 
   /// Calculates the fixed cross axis extent of any child in the grid.
-  double calculateCrossAxisExtent(AxisC axis, SizeC size) {
+  double calculateCrossAxisExtent(AxisC mainAxis, SizeC size) {
     // Total cross axis space available for the grid view.
     final double totalCrossAxisSize =
-        axis.opposite.isHorizontal ? size.width : size.height;
+        mainAxis.opposite.isHorizontal ? size.width : size.height;
 
     switch (properties.gridDelegate) {
       case FixedCrossAxisCountGridDelegateProperties prop:

lib/src/api/utils.dart

@@ -49,6 +49,9 @@ abstract class ITextSizeCalculator {
 
   /// Returns the line height of a single line of text.
   double getLineHeight();
+
+  /// Disposes of this calculator.
+  void dispose();
 }
 
 /// Defines different styling options for a widget.