ILAst and IL get bracket-matching via CSharpBracketSearcher

Language.BracketSearcher defaulted to DefaultBracketSearcher
(no-op); only CSharpLanguage overrode it. Switching the active
language to ILAst or IL left caret-on-bracket inert.

Assisted-by: Claude:claude-opus-4-7:Claude Code

ILSpy/Languages/ILAstLanguage.cs

@@ -57,6 +57,11 @@ namespace ILSpy.Languages
 			this.name = name;
 		}
 
+		// ILAst output uses the same `{}/()/[]` bracket conventions as C#, plus C#-style
+		// `//` comments and `"..."` strings. Reusing CSharpBracketSearcher gives the
+		// language correct bracket highlighting without a per-grammar implementation.
+		public override ILSpy.TextView.IBracketSearcher BracketSearcher { get; } = new CSharpBracketSearcher();
+
 		/// <summary>
 		/// Fires after a <see cref="DecompileMethod"/> run installs a fresh <see cref="Stepper"/>.
 		/// The Debug Steps pane subscribes here so it can rebind its TreeView to the new

ILSpy/Languages/ILLanguage.cs

@@ -41,6 +41,10 @@ namespace ILSpy.Languages
 
 		public override string FileExtension => ".il";
 
+		// Disassembled IL uses the same `{}/()/[]` bracket conventions plus C#-style
+		// `//` comments and `"..."` strings — reuse CSharpBracketSearcher's logic.
+		public override ILSpy.TextView.IBracketSearcher BracketSearcher { get; } = new CSharpBracketSearcher();
+
 		// DisplaySettings (ShowMetadataTokens / ShowRawRVAOffsetAndBytes /
 		// DecodeCustomAttributeBlobs / ShowMetadataTokensInBase10) aren't wired yet — once
 		// they are, plumb them in here. All four default to false.