[cross_file] Improved documentation about ignored parameters in IO module. (flutter#4416)

Hello guys, following the discussion in the issue below here I've tried to document all the ignored constructor parameters that are available but never used in the IO module.

- flutter#87812

Author: andreacioni

packages/cross_file/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.3+6
+
+* Improves documentation about ignored parameters in IO implementation.
+
 ## 0.3.3+5
 
 * Adds pub topics to package metadata.

packages/cross_file/lib/src/types/base.dart

@@ -38,6 +38,8 @@ abstract class XFileBase {
 
   /// The name of the file as it was selected by the user in their device.
   ///
+  /// For non-web implementation, this represents the last part of the filesystem path.
+  ///
   /// Use only for cosmetic reasons, do not try to use this as a path.
   String get name {
     throw UnimplementedError('.name has not been implemented.');

packages/cross_file/lib/src/types/io.dart

@@ -17,6 +17,13 @@ class XFile extends XFileBase {
   /// [bytes] is ignored; the parameter exists only to match the web version of
   /// the constructor. To construct a dart:io XFile from bytes, use
   /// [XFile.fromData].
+  ///
+  /// [name] is ignored; the parameter exists only to match the web version of
+  /// the constructor.
+  ///
+  /// [length] is ignored; the parameter exists only to match the web version of
+  /// the constructor.
+  ///
   // ignore: use_super_parameters
   XFile(
     String path, {
@@ -32,6 +39,9 @@ class XFile extends XFileBase {
         super(path);
 
   /// Construct an CrossFile from its data
+  ///
+  /// [name] is ignored; the parameter exists only to match the web version of
+  /// the constructor.
   XFile.fromData(
     Uint8List bytes, {
     String? mimeType,

packages/cross_file/pubspec.yaml

@@ -2,7 +2,7 @@ name: cross_file
 description: An abstraction to allow working with files across multiple platforms.
 repository: https://github.com/flutter/packages/tree/main/packages/cross_file
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+cross_file%22
-version: 0.3.3+5
+version: 0.3.3+6
 
 environment:
   sdk: ">=2.19.0 <4.0.0"