Fixed horrible crash bug with opening vim.

tests/unit/test_pty_terminal_sequences.py

@@ -24,6 +24,16 @@ def test_csi_sequences_with_intermediate_characters_do_not_render_final_byte():
     assert "p" not in screen["text"]
 
 
+@pytest.mark.unit
+def test_private_sgr_sequence_from_fullscreen_apps_does_not_crash():
+    terminal = Terminal(10, 3, DummyProcessInput())
+
+    terminal.feed(b"\x1b[?25;7mX")
+    screen = terminal.get_screen_content()
+
+    assert screen["text"].splitlines()[0] == "X         "
+
+
 @pytest.mark.unit
 def test_optional_float_setting_uses_default_when_missing():
     settings_manager = type(