Fix center-alignment of border/preview label

Fix #3421

2 files changed, 8 insertions, 1 deletions

diff --git a/src/terminal.go b/src/terminal.go
index c7e86209..6418a5df 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -781,7 +781,7 @@ func (t *Terminal) ansiLabelPrinter(str string, color *tui.ColorPair, fill bool)
 				window.CPrint(*color, str)
 			}
 		}
-		return printFn, len(text)
+		return printFn, length
 	}
 
 	// Printer that correctly handles ANSI color codes and tab characters
diff --git a/src/util/util_test.go b/src/util/util_test.go
index 27e7a049..42a66636 100644
--- a/src/util/util_test.go
+++ b/src/util/util_test.go
@@ -184,3 +184,10 @@ func TestRepeatToFill(t *testing.T) {
 		t.Error("Expected:", strings.Repeat("abcde", 4)+"abcde"[:2])
 	}
 }
+
+func TestStringWidth(t *testing.T) {
+	w := StringWidth("─")
+	if w != 1 {
+		t.Errorf("Expected: %d, Actual: %d", 1, w)
+	}
+}