ledger.Files.?etLastNLines trims empty lines

src/ledger/file.go

@@ -11,6 +11,7 @@ import (
 	"path"
 	"path/filepath"
 	"sort"
+	"strings"
 	"unicode"
 )
 
@@ -54,6 +55,9 @@ func (files Files) TempSetLastNLines(n int, lines []string) error {
 			return "", err
 		}
 		for i := range lines {
+			if len(strings.TrimSpace(lines[i])) == 0 {
+				continue
+			}
 			if _, err := fmt.Fprintln(w, lines[i]); err != nil {
 				return "", err
 			}
@@ -87,7 +91,7 @@ func peekLastNLines(w io.Writer, r *bufio.Reader, n int) ([]string, error) {
 	lastNLines := make([]string, 0, n)
 	for {
 		line, err := r.ReadBytes('\n')
-		if len(line) > 0 {
+		if len(bytes.TrimSpace(line)) > 0 {
 			lastNLines = append(lastNLines, string(bytes.TrimRight(line, "\n")))
 			for i := 0; i < len(lastNLines)-n; i++ {
 				fmt.Fprintln(w, lastNLines[i])