[PTRun]Improve fuzzy search for queries (#20064)

* Update StringMatcher.cs

* Update tests

* Remove comment

src/modules/launcher/Wox.Infrastructure/StringMatcher.cs

@@ -56,6 +56,27 @@ namespace Wox.Infrastructure
         /// 7. Consider success and move onto scoring if every char or substring without whitespaces matched
         /// </summary>
         public MatchResult FuzzyMatch(string query, string stringToCompare, MatchOption opt)
+        {
+            if (string.IsNullOrEmpty(stringToCompare))
+            {
+                return new MatchResult(false, UserSettingSearchPrecision);
+            }
+
+            var bestResult = new MatchResult(false, UserSettingSearchPrecision);
+
+            for (int startIndex = 0; startIndex < stringToCompare.Length; startIndex++)
+            {
+                MatchResult result = FuzzyMatch(query, stringToCompare, opt, startIndex);
+                if (result.Success && (!bestResult.Success || result.Score > bestResult.Score))
+                {
+                    bestResult = result;
+                }
+            }
+
+            return bestResult;
+        }
+
+        private MatchResult FuzzyMatch(string query, string stringToCompare, MatchOption opt, int startIndex)
         {
             if (string.IsNullOrEmpty(stringToCompare) || string.IsNullOrEmpty(query))
             {
@@ -88,7 +109,7 @@ namespace Wox.Infrastructure
             var indexList = new List<int>();
             List<int> spaceIndices = new List<int>();
 
-            for (var compareStringIndex = 0; compareStringIndex < fullStringToCompareWithoutCase.Length; compareStringIndex++)
+            for (var compareStringIndex = startIndex; compareStringIndex < fullStringToCompareWithoutCase.Length; compareStringIndex++)
             {
                 // To maintain a list of indices which correspond to spaces in the string to compare
                 // To populate the list only for the first query substring
@@ -239,7 +260,12 @@ namespace Wox.Infrastructure
             // A match found near the beginning of a string is scored more than a match found near the end
             // A match is scored more if the characters in the patterns are closer to each other,
             // while the score is lower if they are more spread out
-            var score = 100 * (query.Length + 1) / ((1 + firstIndex) + (matchLen + 1));
+
+            // The length of the match is assigned a larger weight factor.
+            // I.e. the length is more important than where in the string a match is found.
+            const int matchLenWeightFactor = 2;
+
+            var score = 100 * (query.Length + 1) * matchLenWeightFactor / ((1 + firstIndex) + (matchLenWeightFactor * (matchLen + 1)));
 
             // A match with less characters assigning more weights
             if (stringToCompare.Length - query.Length < 5)

src/modules/launcher/Wox.Test/FuzzyMatcherTest.cs

@@ -156,7 +156,7 @@ namespace Wox.Test
         [DataRow("goo", "Google Chrome", StringMatcher.SearchPrecisionScore.Regular, true)]
         [DataRow("chr", "Google Chrome", StringMatcher.SearchPrecisionScore.Low, true)]
         [DataRow("chr", "Chrome", StringMatcher.SearchPrecisionScore.Regular, true)]
-        [DataRow("chr", "Help cure hope raise on mind entity Chrome", StringMatcher.SearchPrecisionScore.Regular, false)]
+        [DataRow("chr", "Help cure hope raise on mind entity Chrome", StringMatcher.SearchPrecisionScore.Regular, true)]
         [DataRow("chr", "Help cure hope raise on mind entity Chrome", StringMatcher.SearchPrecisionScore.Low, true)]
         [DataRow("chr", "Candy Crush Saga from King", StringMatcher.SearchPrecisionScore.Regular, false)]
         [DataRow("chr", "Candy Crush Saga from King", StringMatcher.SearchPrecisionScore.None, true)]
@@ -203,7 +203,7 @@ namespace Wox.Test
         [DataRow("mic", MicrosoftSqlServerManagementStudio, StringMatcher.SearchPrecisionScore.Regular, true)]
         [DataRow("chr", "Shutdown", StringMatcher.SearchPrecisionScore.Regular, false)]
         [DataRow("mssms", MicrosoftSqlServerManagementStudio, StringMatcher.SearchPrecisionScore.Regular, false)]
-        [DataRow("chr", "Change settings for text-to-speech and for speech recognition (if installed).", StringMatcher.SearchPrecisionScore.Regular, false)]
+        [DataRow("chr", "Change settings for text-to-speech and for speech recognition (if installed).", StringMatcher.SearchPrecisionScore.Regular, true)]
         [DataRow("ch r", "Change settings for text-to-speech and for speech recognition (if installed).", StringMatcher.SearchPrecisionScore.Regular, true)]
         [DataRow("a test", "This is a test", StringMatcher.SearchPrecisionScore.Regular, true)]
         [DataRow("test", "This is a test", StringMatcher.SearchPrecisionScore.Regular, true)]