From dfa461b46b9098d566f73072827b9204315ffde2 Mon Sep 17 00:00:00 2001
From: Dmitry Nefedov <113844030+dangooddd@users.noreply.github.com>
Date: Wed, 27 Nov 2024 23:52:20 +0300
Subject: [PATCH] Clear terminal output of interactive screen on resize if
 alternate screen not in use (#952)

---
 src/ftxui/component/screen_interactive.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/ftxui/component/screen_interactive.cpp b/src/ftxui/component/screen_interactive.cpp
index b5643ed..45a4fff 100644
--- a/src/ftxui/component/screen_interactive.cpp
+++ b/src/ftxui/component/screen_interactive.cpp
@@ -858,6 +858,13 @@ void ScreenInteractive::Draw(Component component) {
   ResetCursorPosition();
   std::cout << ResetPosition(/*clear=*/resized);
 
+  // If the terminal width decrease, the terminal emulator will start wrapping
+  // lines and make the display dirty. We should clear it completely.
+  if ((dimx < dimx_) && !use_alternative_screen_) {
+    std::cout << "\033[J";  // clear terminal output
+    std::cout << "\033[H";  // move cursor to home position
+  }
+
   // Resize the screen if needed.
   if (resized) {
     dimx_ = dimx;