fix: restore cursor position

Author: katsyuta

src/features/MonakoEditor/MonacoEditor.tsx

@@ -273,7 +273,20 @@ export const MonacoEditor = ({
 		if (!editor) return;
 
 		if (editor.getValue() !== value) {
+			// Save the cursor position before calling setValue, because it resets the cursor to 0:0
+			const position = editor.getPosition();
 			editor.setValue(value);
+
+			if (position) {
+				const model = editor.getModel();
+				if (!model) return;
+
+				// Keep the cursor within valid bounds in case the new value is shorter than the previous one
+				const line = Math.min(position.lineNumber, model.getLineCount());
+				const column = Math.min(position.column, model.getLineMaxColumn(line));
+
+				editor.setPosition({ lineNumber: line, column });
+			}
 		}
 	});