Increase description/topic weights by removing the document length compensation. (#8294)

Author: isoos

app/lib/search/mem_index.dart

@@ -79,6 +79,7 @@ class InMemoryPackageIndex {
     _descrIndex = TokenIndex(
       packageKeys,
       _documents.map((d) => d.description).toList(),
+      skipDocumentWeight: true,
     );
     _readmeIndex = TokenIndex(
       packageKeys,

app/lib/search/token_index.dart

@@ -34,7 +34,11 @@ class TokenIndex<K> {
 
   late final _length = _ids.length;
 
-  TokenIndex(List<K> ids, List<String?> values) : _ids = ids {
+  TokenIndex(
+    List<K> ids,
+    List<String?> values, {
+    bool skipDocumentWeight = false,
+  }) : _ids = ids {
     assert(ids.length == values.length);
     final length = values.length;
     for (var i = 0; i < length; i++) {
@@ -48,7 +52,8 @@ class TokenIndex<K> {
         continue;
       }
       // Document weight is a highly scaled-down proxy of the length.
-      final dw = 1 + math.log(1 + tokens.length) / 100;
+      final dw =
+          skipDocumentWeight ? 1.0 : 1 + math.log(1 + tokens.length) / 100;
       for (final e in tokens.entries) {
         final token = e.key;
         final weights = _inverseIds.putIfAbsent(token, () => {});

app/test/search/bluetooth_test.dart

@@ -40,7 +40,7 @@ void main() {
         'packageHits': [
           {
             'package': 'flutter_blue',
-            'score': closeTo(0.98, 0.01),
+            'score': 1.0,
           },
         ],
       });

app/test/search/in_app_payments_test.dart

@@ -52,7 +52,7 @@ Add _In-App Payments_ to your Flutter app with this plugin.''')),
         'packageHits': [
           {
             'package': 'flutter_iap',
-            'score': closeTo(0.70, 0.01),
+            'score': closeTo(0.73, 0.01),
           },
         ],
       });

app/test/search/json_tool_test.dart

@@ -68,8 +68,8 @@ void main() {
         'totalCount': 3,
         'sdkLibraryHits': [],
         'packageHits': [
+          {'package': 'json2entity', 'score': 1.0},
           {'package': 'jsontool', 'score': 1.0},
-          {'package': 'json2entity', 'score': closeTo(0.97, 0.01)},
           {'package': 'json_to_model', 'score': closeTo(0.73, 0.01)},
         ],
       });

app/test/search/mem_index_test.dart

@@ -109,7 +109,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
         'packageHits': [
           {
             'package': 'http',
-            'score': closeTo(0.93, 0.01),
+            'score': closeTo(0.96, 0.01),
           },
         ],
       });
@@ -140,7 +140,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
         'sdkLibraryHits': [],
         'packageHits': [
           {'package': 'http', 'score': closeTo(0.69, 0.01)},
-          {'package': 'async', 'score': closeTo(0.63, 0.01)},
+          {'package': 'async', 'score': closeTo(0.65, 0.01)},
         ],
       });
     });
@@ -381,7 +381,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
         'totalCount': 1,
         'sdkLibraryHits': [],
         'packageHits': [
-          {'package': 'http', 'score': closeTo(0.93, 0.01)},
+          {'package': 'http', 'score': closeTo(0.96, 0.01)},
         ],
       });
     });
@@ -494,7 +494,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
         'totalCount': 1,
         'sdkLibraryHits': [],
         'packageHits': [
-          {'package': 'http', 'score': closeTo(0.98, 0.01)},
+          {'package': 'http', 'score': 1.0},
         ],
       });
 
@@ -505,8 +505,8 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
         'totalCount': 3,
         'sdkLibraryHits': [],
         'packageHits': [
-          {'package': 'chrome_net', 'score': closeTo(0.98, 0.01)},
-          {'package': 'async', 'score': closeTo(0.98, 0.01)},
+          {'package': 'async', 'score': 1.0},
+          {'package': 'chrome_net', 'score': 1.0},
           {'package': 'http', 'score': closeTo(0.72, 0.01)},
         ],
       });
@@ -520,7 +520,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
         'totalCount': 1,
         'sdkLibraryHits': [],
         'packageHits': [
-          {'package': 'http', 'score': closeTo(0.70, 0.01)},
+          {'package': 'http', 'score': closeTo(0.72, 0.01)},
         ],
       });
     });
@@ -690,7 +690,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
           'sdkLibraryHits': [],
           'packageHits': [
             {'package': 'flutter_modular', 'score': 1.0},
-            {'package': 'serveme', 'score': closeTo(0.97, 0.01)},
+            {'package': 'serveme', 'score': 1.0},
           ]
         },
       );

app/test/search/rest_api_test.dart

@@ -57,7 +57,7 @@ Recent versions (0.3.x and 0.4.x) of this plugin require [extensible codec funct
         'packageHits': [
           {
             'package': 'currency_cloud',
-            'score': closeTo(0.95, 0.01),
+            'score': 1.0,
           },
           {
             'package': 'cloud_firestore', // finds `rest` in name