Allow empty window name.

Author: ckt114

src/libtmux/session.py

@@ -253,6 +253,9 @@ def new_window(
         if window_name:
             window_args += ("-n%s" % window_name,)
 
+        if window_name == '':
+            window_args += ('-n', '')
+
         window_args += (
             # empty string for window_index will use the first one available
             "-t%s:%s"

tests/test_window.py

@@ -290,3 +290,11 @@ def test_select_layout_accepts_no_arg(server: Server, session: Session) -> None:
 
     window = session.new_window(window_name="test_window")
     window.select_layout()
+
+
+def test_empty_window_name(session: Session) -> None:
+    session.set_option("automatic-rename", "off")
+    window = session.new_window(window_name="''", attach=True)
+
+    assert window == session.attached_window
+    assert window.get("window_name") == "''"