don't leave old character data in the second cell of a wide character

otherwise it might confuse the diffing algorithm if a non-wide character
is written there and then it goes back to being the second cell of a
wide character

1 files changed, 7 insertions, 1 deletions

diff --git a/src/screen.rs b/src/screen.rs
index 1a748e0..7224f6a 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -504,7 +504,13 @@ impl Screen {
             }
         } else {
             cell.set(c.to_string(), attrs);
-            self.grid_mut().col_inc(width);
+            self.grid_mut().col_inc(1);
+            if width > 1 {
+                let bgcolor = self.attrs.bgcolor;
+                let next_cell = self.current_cell_mut();
+                next_cell.clear(bgcolor);
+                self.grid_mut().col_inc(1);
+            }
         }
     }