Fix lacking space panic

helix-term/src/ui/markdown.rs

@@ -342,13 +342,10 @@ impl Component for Markdown {
 
     fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
         let padding = 2;
-        if padding >= viewport.1 || padding >= viewport.0 {
-            return None;
-        }
         let contents = self.parse(None);
 
         // TODO: account for tab width
-        let max_text_width = (viewport.0 - padding).min(120);
+        let max_text_width = (viewport.0.saturating_sub(padding)).min(120);
         let (width, height) = crate::ui::text::required_size(&contents, max_text_width);
 
         Some((width + padding, height + padding))

helix-tui/src/buffer.rs

@@ -510,9 +510,13 @@ impl Buffer {
     pub fn clear_with(&mut self, area: Rect, style: Style) {
         for x in area.left()..area.right() {
             for y in area.top()..area.bottom() {
-                let cell = &mut self[(x, y)];
-                cell.reset();
-                cell.set_style(style);
+                if let Some(cell) = &mut self.get_mut(x, y) {
+                    cell.reset();
+                    cell.set_style(style);
+                } else {
+                    // Skip this render if the window size has changed
+                    continue;
+                }
             }
         }
     }

helix-view/src/graphics.rs

@@ -237,8 +237,8 @@ impl Rect {
         Rect {
             x: x1,
             y: y1,
-            width: x2 - x1,
-            height: y2 - y1,
+            width: x2.saturating_sub(x1),
+            height: y2.saturating_sub(y1),
         }
     }