From 4a8cae34fae8cf0641c1081592bd0c272c0a0d0b Mon Sep 17 00:00:00 2001
From: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>
Date: Wed, 18 Dec 2024 16:03:28 -0300
Subject: [PATCH] fix: do not navigate out to the right

---
 viewport/viewport.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/viewport/viewport.go b/viewport/viewport.go
index 2ff0802..cfa6295 100644
--- a/viewport/viewport.go
+++ b/viewport/viewport.go
@@ -331,9 +331,23 @@ func (m *Model) MoveLeft() {
 
 // MoveRight moves all lines to set runes right.
 func (m *Model) MoveRight() {
+	// prevents over scrolling to the right
+	if m.indent >= m.longestLineWidth()-m.Width {
+		return
+	}
 	m.indent += m.horizontalStep
 }
 
+func (m Model) longestLineWidth() int {
+	w := 0
+	for _, l := range m.lines {
+		if ww := ansi.StringWidth(l); ww > w {
+			w = ww
+		}
+	}
+	return w
+}
+
 // Resets lines indent to zero.
 func (m *Model) ResetIndent() {
 	m.indent = 0