From be7501b08ce424dede45749b9cb1c9db3aab9720 Mon Sep 17 00:00:00 2001
From: unspeaker <hora.nqma@protonmail.com>
Date: Sun, 3 Nov 2024 16:34:05 +0200
Subject: [PATCH] clear on resize, fixing garble

---
 crates/tek_core/src/tui.rs | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/crates/tek_core/src/tui.rs b/crates/tek_core/src/tui.rs
index 658f8773..c1d23c90 100644
--- a/crates/tek_core/src/tui.rs
+++ b/crates/tek_core/src/tui.rs
@@ -4,7 +4,7 @@ pub(crate) use crossterm::{ExecutableCommand};
 pub use crossterm::event::{Event, KeyEvent, KeyCode, KeyModifiers};
 pub use ratatui::prelude::{Rect, Style, Color, Buffer};
 pub use ratatui::style::{Stylize, Modifier};
-use ratatui::backend::{Backend, CrosstermBackend};
+use ratatui::backend::{Backend, CrosstermBackend, ClearType};
 use std::io::Stdout;
 use crossterm::terminal::{
     EnterAlternateScreen, LeaveAlternateScreen,
@@ -97,17 +97,20 @@ impl Tui {
         let exited = engine.read().unwrap().exited.clone();
         let engine = engine.clone();
         let state  = state.clone();
-        let mut buffer = Buffer::empty(
-            engine.read().unwrap().backend.size().expect("get size failed")
-        );
+        let size   = engine.read().unwrap().backend.size().expect("get size failed");
+        let mut buffer = Buffer::empty(size);
         spawn(move || loop {
             if exited.fetch_and(true, Ordering::Relaxed) {
                 break
             }
-            let size = engine.read().unwrap().backend.size().expect("get size failed");
+            let size = engine.read().unwrap().backend.size()
+                .expect("get size failed");
             if let Ok(state) = state.try_read() {
                 if buffer.area != size {
+                    engine.write().unwrap().backend.clear_region(ClearType::All)
+                        .expect("clear failed");
                     buffer.resize(size);
+                    buffer.reset();
                 }
                 let mut output = TuiOutput { buffer, area: size.xywh() };
                 state.render(&mut output).expect("render failed");
@@ -118,7 +121,9 @@ impl Tui {
     }
     fn flip (&mut self, mut buffer: Buffer, size: ratatui::prelude::Rect) -> Buffer {
         if self.buffer.area != size {
+            self.backend.clear_region(ClearType::All).unwrap();
             self.buffer.resize(size);
+            self.buffer.reset();
         }
         let updates = self.buffer.diff(&buffer);
         self.backend.draw(updates.into_iter()).expect("failed to render");