Merge pull request #20575 from CyrusNajmabadi/patternMatchingCheck

Avoid costly check on every candidate we check against.

src/Workspaces/Core/Portable/PatternMatching/PatternMatcher.TextChunk.cs

@@ -27,6 +27,8 @@ private struct TextChunk : IDisposable
 
             public readonly WordSimilarityChecker SimilarityChecker;
 
+            public readonly bool IsLowercase;
+
             public TextChunk(string text, bool allowFuzzingMatching)
             {
                 this.Text = text;
@@ -34,6 +36,8 @@ public TextChunk(string text, bool allowFuzzingMatching)
                 this.SimilarityChecker = allowFuzzingMatching
                     ? WordSimilarityChecker.Allocate(text, substringsAreSimilar: false)
                     : null;
+
+                IsLowercase = !ContainsUpperCaseLetter(text);
             }
 
             public void Dispose()

src/Workspaces/Core/Portable/PatternMatching/PatternMatcher.cs

@@ -187,7 +187,7 @@ private static bool ContainsUpperCaseLetter(string pattern)
                 }
             }
 
-            var isLowercase = !ContainsUpperCaseLetter(patternChunk.Text);
+            var isLowercase = patternChunk.IsLowercase;
             if (isLowercase)
             {
                 if (caseInsensitiveIndex > 0)