fix ci fail

Author: yp05327

modules/indexer/code/search.go

@@ -76,6 +76,7 @@ func searchResult(result *internal.SearchResult, startIndex, endIndex int) (*Res
 
 	contentLines := strings.SplitAfter(result.Content[startIndex:endIndex], "\n")
 	lines := make([]ResultLine, 0, len(contentLines))
+	highlightedLines := make([]string, 0, len(contentLines))
 	index := startIndex
 	for i, line := range contentLines {
 		var err error
@@ -100,11 +101,17 @@ func searchResult(result *internal.SearchResult, startIndex, endIndex int) (*Res
 
 		lines = append(lines, ResultLine{Num: startLineNum + i})
 		index += len(line)
+
+		// highlight.Code will remove the last `\n`, e.g. if input is `a\n`, output will be `a`
+		// Then the length of `lines` and `highlightedLines` will not be equal, so we need to add an empty line manually
+		if line == "" {
+			highlightedLines = append(highlightedLines, "")
+		}
 	}
 
 	// we should highlight the whole code block first, otherwise it doesn't work well with multiple line highlighting
 	hl, _ := highlight.Code(result.Filename, "", formattedLinesBuffer.String())
-	highlightedLines := strings.Split(string(hl), "\n")
+	highlightedLines = append(strings.Split(string(hl), "\n"), highlightedLines...)
 
 	if len(highlightedLines) != len(lines) {
 		return nil, fmt.Errorf("the length of line numbers [%d] don't match the length of highlighted contents [%d]", len(lines), len(highlightedLines))