620eaf1ada
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.
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