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Add a note about over large scrollback fill

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Kovid Goyal 2021-04-23 15:54:21 +05:30
parent bd746e5151
commit 3c39cbf333
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1 changed files with 8 additions and 4 deletions
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docs/protocol-extensions.rst
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@ -172,10 +172,14 @@ instead of being blank.
The motivation for this is that many modern shells will show completions in a 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 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 lost even after the completion is completed, because it has scrolled off
screen. This escape code allows that text to be restored. If the scrollback screen. This escape code allows that text to be restored.
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 If the scrollback buffer is empty or there is no scrollback buffer, such as for
``SD`` escape code. the alternate screen, then the newly inserted lines must be empty, just as with
the original ``SD`` escape code. The maximum number of lines that can be
scrolled down is the height of the screen, i.e. the number of lines on the screen.
If the escape code requests more than that number of lines, the terminal *must*
clip the request to the current screen size.
The syntax of the escape code is identical to that of ``SD`` except that it has 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 a trailing ``+`` modifier. This is legal under the `ECMA 48 standard