From 0de5bbd13e64e22bb1984d92e33017f157755bf0 Mon Sep 17 00:00:00 2001
From: phranck <phranck@phranck.dev>
Date: Wed, 28 Jan 2026 21:22:28 +0100
Subject: [PATCH] fix: Preserve background color after ANSI reset codes

Replace all reset codes in rendered content with 'reset + restore background'
to ensure the theme background persists after styled text ends.

This fixes the issue where text with ANSI formatting would reset the
background color, leaving parts of the terminal with the wrong background.
---
 Sources/TUIKit/App/App.swift | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/Sources/TUIKit/App/App.swift b/Sources/TUIKit/App/App.swift
index c3f5a88..404b664 100644
--- a/Sources/TUIKit/App/App.swift
+++ b/Sources/TUIKit/App/App.swift
@@ -555,7 +555,10 @@ internal final class AppRunner<A: App> {
             
             let visibleWidth = line.strippedLength
             let padding = max(0, terminalWidth - visibleWidth)
-            let paddedLine = bgCode + line + String(repeating: " ", count: padding) + reset
+            
+            // Replace all reset codes with "reset + restore background"
+            let lineWithBg = line.replacingOccurrences(of: reset, with: reset + bgCode)
+            let paddedLine = bgCode + lineWithBg + String(repeating: " ", count: padding) + reset
             terminal.write(paddedLine)
         }
     }
@@ -643,7 +646,7 @@ extension WindowGroup: SceneRenderable {
         let bgCode = ANSIRenderer.backgroundCode(for: bgColor)
         let reset = ANSIRenderer.reset
         
-        // Write buffer to terminal, wrapping each line with background color
+        // Write buffer to terminal, ensuring consistent background color
         for row in 0..<terminalHeight {
             terminal.moveCursor(toRow: 1 + row, column: 1)
             
@@ -652,9 +655,12 @@ extension WindowGroup: SceneRenderable {
                 let visibleWidth = line.strippedLength
                 let padding = max(0, terminalWidth - visibleWidth)
                 
-                // Wrap entire line with background: bg + content + padding + reset
-                // The bgCode sets the background for everything that follows
-                let paddedLine = bgCode + line + String(repeating: " ", count: padding) + reset
+                // Replace all reset codes with "reset + restore background"
+                // This ensures background color persists after styled text
+                let lineWithBg = line.replacingOccurrences(of: reset, with: reset + bgCode)
+                
+                // Wrap entire line with background
+                let paddedLine = bgCode + lineWithBg + String(repeating: " ", count: padding) + reset
                 terminal.write(paddedLine)
             } else {
                 // Empty row - fill with background color