make editor grid access more robust

src/renderer/cursor_renderer.rs

@@ -201,12 +201,17 @@ impl CursorRenderer {
 
         let (character, font_dimensions): (String, Point) = {
             let editor = EDITOR.lock().unwrap();
-            let character = editor.grid[grid_y as usize][grid_x as usize].clone()
+            let character = editor.grid
+                .get(grid_y as usize)
+                .and_then(|row| row.get(grid_x as usize).cloned())
+                .flatten()
                 .map(|(character, _)| character)
                 .unwrap_or(' '.to_string());
-            let is_double = editor.grid[grid_y as usize]
-                .get(grid_x as usize + 1)
-                .map(|cell| cell.as_ref().map(|(character, _)| character.is_empty()).unwrap_or(false))
+            let is_double = editor.grid
+                .get(grid_y as usize)
+                .and_then(|row| row.get(grid_x as usize + 1).cloned())
+                .flatten()
+                .map(|(character, _)| character.is_empty())
                 .unwrap_or(false);
 
             let font_width = match (is_double, &cursor.shape) {

src/window.rs

@@ -171,14 +171,11 @@ pub fn ui_loop() {
                 let frame_start = Instant::now();
 
                 if REDRAW_SCHEDULER.should_draw() {
-                    if let Err(e) = skulpin_renderer.draw(&window, |canvas, coordinate_system_helper| {
+                    skulpin_renderer.draw(&window, |canvas, coordinate_system_helper| {
                         if renderer.draw(canvas, coordinate_system_helper) {
                             handle_new_grid_size(window.inner_size(), &renderer)
                         }
-
-                    }) {
-                        println!("Error during draw: {:?}", e);
-                    }
+                    }).ok();
                 }
 
                 *control_flow = ControlFlow::WaitUntil(frame_start + Duration::from_secs_f32(1.0 / 60.0));