From 28e3e6b259785e61eb6690970d1f3141739cefa6 Mon Sep 17 00:00:00 2001
From: Sergio Garcia <git-committer@sergiogarcia.dev>
Date: Mon, 9 Feb 2026 12:53:28 -0300
Subject: [PATCH] fix: use non graphic char for changed bytes in ASCII panel

---
 src/hex/draw.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/hex/draw.rs b/src/hex/draw.rs
index 6785498..f5243ce 100644
--- a/src/hex/draw.rs
+++ b/src/hex/draw.rs
@@ -186,7 +186,12 @@ pub fn draw_hex_ascii(app: &mut App, frame: &mut Frame, area: Rect) {
             // Converte para um u8 numérico. Se não rolar, é porque deu uma
             // merda muito grande pois só deveria ter hex strings no hashmap.
             let num = u8::from_str_radix(s, 16).unwrap();
-            let c = num as char;
+            // If changed byte is not printable use the non graphic char instead
+            let c = if (num as char).is_ascii_graphic() {
+                num as char
+            } else {
+                app.config.hex_mode_non_graphic_char
+            };
             // Agora cria uma string a partir do char `c`
             // Parece doido, mas isso faz "41" -> 0x41 -> "A"
             let s = String::from(c);