ui thrashing

src/core/render.rs

@@ -3,6 +3,21 @@ pub(crate) use ratatui::prelude::*;
 pub(crate) use ratatui::buffer::Cell;
 use ratatui::widgets::WidgetRef;
 
+pub fn fill_bg (buf: &mut Buffer, area: Rect, color: Color) {
+    let Rect { x, y, width, height } = area;
+    for y in y..y+height {
+        if y >= buf.area.height {
+            break
+        }
+        for x in x..x+width {
+            if x >= buf.area.width {
+                break
+            }
+            buf.get_mut(x, y).set_bg(color);
+        }
+    }
+}
+
 pub trait Blit {
     // Render something to X, Y coordinates in a buffer, ignoring width/height.
     fn blit (&self, buf: &mut Buffer, x: u16, y: u16, style: Option<Style>);