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Add a note about what happens when no scrollback lines are present

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Kovid Goyal 2021-04-23 15:48:47 +05:30
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commit bd746e5151
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docs/protocol-extensions.rst
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@ -172,7 +172,10 @@ instead of being blank.
The motivation for this is that many modern shells will show completions in a
block of lines under the cursor, this causes some of the on-screen text to be
lost even after the completion is completed, because it has scrolled off
screen. This escape code allows that text to be restored.
screen. This escape code allows that text to be restored. If the scrollback
buffer is empty or there is no scrollback buffer, such as for the alternate
screen, then the newly inserted lines must be empty, just as with the original
``SD`` escape code.
The syntax of the escape code is identical to that of ``SD`` except that it has
a trailing ``+`` modifier. This is legal under the `ECMA 48 standard