ToggleIndent        <Ctrl QI> or <Esc><O><A>
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    Toggles AutoIndent mode ON and OFF.  If ON, the cursor is positioned
    at the current left margin whenever the <Enter> key is pressed.
    The current left margin is determined by the first non-blank
    character on the immediately preceding line.

    Paragraph reformatting and word-wrapping will also use the current
    left margin when AutoIndent mode is ON.

    The letter "A" will appear on the Status Line when this mode is ON.