App UI - menu - unify disabled state

[user0]

XnViewMP 1.8.0 64bit
Windows11 (23H2), display resolution 3840x2160, win scaling 150%

App UI - menu - consistency of disabled state
some menus with disabled items are expandable (highlighted on pic), some are not, which is inconvenient

app_ui_menu_disabled_state_consistency.png

Suggestion

• unify menu behavior
  disable menu if all its items are disabled