fix(ui): panic in rightPad

terminal/actor.go

@@ -464,8 +464,11 @@ func (a *Actor) showAbout() {
 }
 
 func rightPad(s string, n int) string {
-	if s == "" {
+	if s == "" || len(s) == n {
 		return s
 	}
+	if len(s) > n {
+		return s[:n]
+	}
 	return s + strings.Repeat(" ", n-len(s))
 }

terminal/actor_test.go

@@ -0,0 +1,42 @@
+package terminal
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRightPad(t *testing.T) {
+	testCases := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{
+			name:  "empty string",
+			input: "",
+			want:  "",
+		},
+		{
+			name:  "short string",
+			input: "foo",
+			want:  "foo   ",
+		},
+		{
+			name:  "string with equal lenth to required width",
+			input: "foobar",
+			want:  "foobar",
+		},
+		{
+			name:  "long string",
+			input: "foobarbaz",
+			want:  "foobar",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			assert.Equal(t, tc.want, rightPad(tc.input, 6))
+		})
+	}
+}