Improve socket handling for -x spawned fenrir instances.

tests/unit/test_pty_terminal_sequences.py

@@ -0,0 +1,22 @@
+import pytest
+
+from fenrirscreenreader.screenDriver.ptyDriver import Terminal
+
+
+class DummyProcessInput:
+    def __init__(self):
+        self.data = []
+
+    def write(self, data):
+        self.data.append(data)
+
+
+@pytest.mark.unit
+def test_csi_sequences_with_intermediate_characters_do_not_render_final_byte():
+    terminal = Terminal(10, 3, DummyProcessInput())
+
+    terminal.feed(b"\x1b[2026$p\x1b[2048$pX")
+    screen = terminal.get_screen_content()
+
+    assert screen["text"].splitlines()[0] == "X         "
+    assert "p" not in screen["text"]