Merge pull request #381 from ace6807/fix/undo-after-revert-all

fix(322): fix undo/redo after reverting all changes

src/tab.rs

@@ -128,11 +128,26 @@ impl EditorTab {
             let scroll = editor.with_buffer(|buffer| buffer.scroll());
             //TODO: save/restore more?
 
-            match editor.load_text(path, self.attrs.clone()) {
+            match std::fs::read_to_string(path) {
-                Ok(()) => {
+                Ok(file_content) => {
                     log::info!("reloaded {:?}", path);
 
-                    // Clear changed state
+                    // Store the entire operation as a single change for undo
+                    editor.start_change();
+                    
+                    // Grab everything in the buffer
+                    let cursor_start: Cursor = cosmic_text::Cursor::new(0, 0);
+                    let cursor_end = editor.with_buffer(|buffer| {
+                        let last_line = buffer.lines.len().saturating_sub(1);
+                        cosmic_text::Cursor::new(last_line, buffer.lines.get(last_line).map(|line| line.text().len()).unwrap_or(0))
+                    });
+                    
+                    // Replace everything in the buffer with the content from disk
+                    editor.delete_range(cursor_start, cursor_end);
+                    editor.insert_at(cursor_start, &file_content, None);
+                    editor.set_cursor(cursor_start);
+                    
+                    editor.finish_change();
                     editor.set_changed(false);
                 }
                 Err(err) => {