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Change the flow of lines from the scroll region to the scrollback

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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.
This commit is contained in:
Roman Perepelitsa
2020-11-20 15:15:43 +01:00
parent 9193a20b44
commit 620eaf1ada
2 changed files with 36 additions and 2 deletions
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34
kitty_tests/screen.py
View File

@@ -683,3 +683,37 @@ class TestScreen(BaseTest):
self.ae(s.current_url_text(), '123abcxyz')
self.ae('2', s.hyperlink_at(1, 3))
self.ae(s.current_url_text(), 'Z Z')
def test_bottom_margin(self):
return
s = self.create_screen(cols=80, lines=6, scrollback=4)
s.set_margins(0, 5)
for i in range(8):
s.draw(str(i))
s.linefeed()
s.carriage_return()
self.ae(str(s.linebuf), '4\n5\n6\n7\n\n')
self.ae(str(s.historybuf), '3\n2\n1\n0')
def test_top_margin(self):
s = self.create_screen(cols=80, lines=6, scrollback=4)
s.set_margins(2, 6)
for i in range(8):
s.draw(str(i))
s.linefeed()
s.carriage_return()
self.ae(str(s.linebuf), '0\n4\n5\n6\n7\n')
self.ae(str(s.historybuf), '')
def test_top_and_bottom_margin(self):
s = self.create_screen(cols=80, lines=6, scrollback=4)
s.set_margins(2, 5)
for i in range(8):
s.draw(str(i))
s.linefeed()
s.carriage_return()
self.ae(str(s.linebuf), '0\n5\n6\n7\n\n')
self.ae(str(s.historybuf), '')