fix: slash menu responds to multiple key events

frontend/appflowy_flutter/packages/appflowy_editor/lib/src/render/selection_menu/selection_menu_widget.dart

@@ -324,7 +324,7 @@ class _SelectionMenuWidgetState extends State<SelectionMenuWidget> {
       _deleteLastCharacters();
       return KeyEventResult.handled;
     } else if (event.character != null &&
-        !arrowKeys.contains(event.logicalKey)) {
+        !arrowKeys.contains(event.logicalKey) && event.logicalKey != LogicalKeyboardKey.tab) {
       keyword += event.character!;
       _insertText(event.character!);
       return KeyEventResult.handled;
@@ -339,7 +339,18 @@ class _SelectionMenuWidgetState extends State<SelectionMenuWidget> {
       newSelectedIndex -= 1;
     } else if (event.logicalKey == LogicalKeyboardKey.arrowDown) {
       newSelectedIndex += 1;
+    }else if (event.logicalKey == LogicalKeyboardKey.tab) {
+      newSelectedIndex += widget.maxItemInRow;
+      var currRow = (newSelectedIndex) % widget.maxItemInRow;
+      if (newSelectedIndex >= _showingItems.length) {
+        if (currRow + 1 >= widget.maxItemInRow) {
+          newSelectedIndex = 0;
+        } else {
+          newSelectedIndex = (currRow + 1);
+        }
+      }
     }
+
     if (newSelectedIndex != _selectedIndex) {
       setState(() {
         _selectedIndex = newSelectedIndex.clamp(0, _showingItems.length - 1);