add support for moving forward tabs

This adds support for moving forward tabs in the grid using `CSI n I`.
This sequence behaves like using tabs `\t` but also accepts a count
argument to move multiple tabs forward.

docs/docs/releases.md

@@ -18,6 +18,7 @@ language: 'en'
 - Kitty keyboard protocol is now enabled by default.
 - Allow `Renderer` to be configured cross-platform by `Platform` property.
 - Add `ToggleFullscreen` to configurable actions.
+- Support for `CSI n I` (Cursor Forward Tabulation) to move the cursor forward by a specified number of tabs.
 
 ## 0.2.2
 

rio-backend/src/crosswords/mod.rs

@@ -2377,7 +2377,13 @@ impl<U: EventListener> Handler for Crosswords<U> {
 
     #[inline]
     fn move_forward_tabs(&mut self, count: u16) {
-        trace!("[unimplemented] Moving forward {} tabs", count);
+        trace!("Moving forward {} tabs", count);
+
+        self.put_tab(count);
+        let cell = self.grid.cursor_cell();
+        if cell.c == ' ' {
+            self.damage_cursor();
+        }
     }
 
     #[inline]