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"\e[84;2u""\e[84;3u""\e[84;5u"Push a new buffer, and set the cursor to the upper left of the new buffer.
This is similar to the standard xterm sequence "\e[?1049h",
but it creates a buffer even if already using the alternate buffer.
(The new buffer is marked as an "alternate" buffer if using "\e[84;5u",
and a "main" buffer otherwise. There isn’t much difference
between them, though they may be styled differently.)
Using "\e[84;3u" (or "\e[84;5u") scrolls the top of the
new buffer to the start of visible window;
using "\e[84;2u" does not automatically scroll.
In either case the default styling separates the new buffer from the
previous buffer with a double line.
"\e[84;1u"Pop the most recent buffer. (Ignored if it is the only buffer.)