Fix index out of scope

Author: intitni

Core/Sources/Service/Workspace.swift

@@ -93,9 +93,12 @@ final class Filespace {
         let suggestionFirstLine = suggestionLines.first ?? ""
 
         // the line content doesn't match the suggestion
-        if cursorPosition.character > 0, !suggestionFirstLine
-            .hasPrefix(editingLine[..<editingLine
-                    .index(editingLine.startIndex, offsetBy: cursorPosition.character)])
+        if cursorPosition.character > 0,
+           !suggestionFirstLine.hasPrefix(editingLine[..<(editingLine.index(
+               editingLine.startIndex,
+               offsetBy: cursorPosition.character,
+               limitedBy: editingLine.endIndex
+           ) ?? editingLine.endIndex)])
         {
             reset()
             return false

Core/Tests/ServiceTests/FilespaceSuggestionInvalidationTests.swift

@@ -91,6 +91,20 @@ class FilespaceSuggestionInvalidationTests: XCTestCase {
         XCTAssertNil(suggestion)
     }
 
+    func test_line_content_does_not_match_input_should_invalidate_index_out_of_scope() async throws {
+        let filespace = try await prepare(
+            suggestionText: "hello man",
+            cursorPosition: .init(line: 1, character: 0)
+        )
+        let isValid = await filespace.validateSuggestions(
+            lines: ["\n", "helo\n", "\n"],
+            cursorPosition: .init(line: 1, character: 100)
+        )
+        XCTAssertFalse(isValid)
+        let suggestion = await filespace.presentingSuggestion
+        XCTAssertNil(suggestion)
+    }
+    
     func test_finish_typing_the_whole_single_line_suggestion_should_invalidate() async throws {
         let filespace = try await prepare(
             suggestionText: "hello man",