Roman Perepelitsa 620eaf1ada Change the flow of lines from the scroll region to the scrollback ...

There are two user-visible changes in here:

1. If a scroll region is set such that there is a bottom margin and no
   top margin, scrolling the region forward used to discard the top
   lines. Now those lines are appended to the scrollback.
   ```shell
   # Assuming a terminal window with 24 lines.
   printf '\033[H\033[J\033[3J\033[0;5r' && seq 100
   ```
   This command used to result in an empty scrollback. Now it contains
   the numbers 1-96.
2. If a scroll region is set such that there is a top margin and no bottom
   margin, scrolling the region forward used to append the top lines to
   the scrollback. Now these lines are discarded.
   ```shell
   # Assuming a terminal window with 24 lines.
   printf '\033[H\033[J\033[3J\033[2;24r' && seq 100
   ```
   This command used to populate scrollback with the numbers 2-78. Now
   the scrollback is empty. The numbers on the screen are the same as
   before: 1 and 79-100.

Related issue: #3113.

2020-11-20 15:41:57 +01:00

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