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Keep scrollback under a full-screen scroll region

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Vaclav Tvrdik
2026-10-20 11:00:04 +02:00
parent 40dac967e2
commit 4669a631ef
2 changed files with 8 additions and 1 deletions
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5
tests/test_emulator.py
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@@ -141,6 +141,11 @@ def run_case(char_by_char):
assert len(screen.history) == 1, (tag, len(screen.history)) assert len(screen.history) == 1, (tag, len(screen.history))
assert screen.history[0][0].data == "a", tag assert screen.history[0][0].data == "a", tag
# an explicit full-screen scroll region still feeds scrollback
proc, screen, stream = make(10, 3)
feed(stream, "\x1b[1;3ra\r\nb\r\nc\r\nd", char_by_char)
assert len(screen.history) == 1, (tag, len(screen.history))
# ED 3 clears history and fires callback # ED 3 clears history and fires callback
cleared = [] cleared = []
proc = FakeProcess() proc = FakeProcess()

4
vterm/emulator.py
View File

@@ -442,7 +442,9 @@ class VtScreen(pyte.Screen):
def index(self): def index(self):
"""Line feed; at the bottom of the primary screen the top row goes to scrollback.""" """Line feed; at the bottom of the primary screen the top row goes to scrollback."""
if not self.alternate_buffer_mode and self.cursor.y == self.lines - 1 and self.margins is None: # a region spanning the whole screen (CSI 1;<lines> r) is no region
full = self.margins is None or self.margins == (0, self.lines - 1)
if not self.alternate_buffer_mode and self.cursor.y == self.lines - 1 and full:
self.push_lines_into_history(1) self.push_lines_into_history(1)
super().index() super().index()