Take space into consideration while calculating the first matched index (#3874)

Author: alekhyareddy28

Flow.Launcher.Infrastructure/StringMatcher.cs

@@ -83,9 +83,18 @@ public MatchResult FuzzyMatch(string query, string stringToCompare, MatchOption
             bool allSubstringsContainedInCompareString = true;
 
             var indexList = new List<int>();
+            List<int> spaceIndices = new List<int>();
 
             for (var compareStringIndex = 0; 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
+                if (fullStringToCompareWithoutCase[compareStringIndex].Equals(' ') && currentQuerySubstringIndex == 0)
+                {
+                    spaceIndices.Add(compareStringIndex);
+                }
+
                 if (fullStringToCompareWithoutCase[compareStringIndex] != currentQuerySubstring[currentQuerySubstringCharacterIndex])
                 {
                     matchFoundInPreviousLoop = false;
@@ -147,14 +156,30 @@ public MatchResult FuzzyMatch(string query, string stringToCompare, MatchOption
             // proceed to calculate score if every char or substring without whitespaces matched
             if (allQuerySubstringsMatched)
             {
-                var score = CalculateSearchScore(query, stringToCompare, firstMatchIndex, lastMatchIndex - firstMatchIndex, allSubstringsContainedInCompareString);
+                var nearestSpaceIndex = CalculateClosestSpaceIndex(spaceIndices, firstMatchIndex);
+                var score = CalculateSearchScore(query, stringToCompare, firstMatchIndex - nearestSpaceIndex - 1, lastMatchIndex - firstMatchIndex, allSubstringsContainedInCompareString);
 
                 return new MatchResult(true, UserSettingSearchPrecision, indexList, score);
             }
 
             return new MatchResult (false, UserSettingSearchPrecision);
         }
 
+        // To get the index of the closest space which preceeds the first matching index
+        private int CalculateClosestSpaceIndex(List<int> spaceIndices, int firstMatchIndex)
+        {
+            if(spaceIndices.Count == 0)
+            {
+                return -1;
+            }
+            else
+            {
+                int? ind = spaceIndices.OrderBy(item => (firstMatchIndex - item)).Where(item => firstMatchIndex > item).FirstOrDefault();
+                int closestSpaceIndex = ind ?? -1;
+                return closestSpaceIndex;
+            }
+        }
+
         private static bool AllPreviousCharsMatched(int startIndexToVerify, int currentQuerySubstringCharacterIndex, 
                                                         string fullStringToCompareWithoutCase, string currentQuerySubstring)
         {