usOperation (USHORT)

Operation that can be undone or redone.
• An undo or redo operation is not possible.

  WM_CHAR

  A WM_CHAR message, or messages for a simple string of keystrokes, can be undone or redone.
  MLM_SETFONT
  A MLM_SETFONT message can be undone or redone.
  MLM_SETTEXTCOLOR
  A MLM_SETTEXTCOLOR message can be undone or redone for both background and foreground color.
  MLM_CUT
  A MLM_CUT message can be undone or redone.
  MLM_PASTE
  A MLM_PASTE message can be undone or redone.
  MLM_CLEAR
  A MLM_CLEAR message can be undone or redone.

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