Fix a regression that broke specifying OS window size in the session file

Fixes #2908

Author: kovidgoyal

docs/changelog.rst

@@ -21,6 +21,10 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
   dimensions or the thickness of the line is an odd number of pixels
   (:iss:`2907`)
 
+- Fix a regression that broke specifying OS window size in the session file
+  (:iss:`2908`)
+
+
 0.18.2 [2020-07-28]
 --------------------
 

kitty/session.py

@@ -21,6 +21,7 @@ class WindowSizeOpts(NamedTuple):
     initial_window_height: Tuple[int, str]
     window_margin_width: FloatEdges
     window_padding_width: FloatEdges
+    single_window_margin_width: FloatEdges
     remember_window_size: bool
 
 
@@ -124,7 +125,7 @@ def finalize_session(ans: Session) -> Session:
             elif cmd == 'os_window_size':
                 from kitty.config_data import window_size
                 w, h = map(window_size, rest.split(maxsplit=1))
-                ans.os_window_size = WindowSizeOpts(w, h, opts.window_margin_width, opts.window_padding_width, False)
+                ans.os_window_size = WindowSizeOpts(w, h, opts.window_margin_width, opts.window_padding_width, opts.single_window_margin_width, False)
             elif cmd == 'os_window_class':
                 ans.os_window_class = rest
             else: