Fix resize-os-window slightly incorrect on high DPI

Caused by premature clamping of a floating point number

docs/changelog.rst

@@ -90,6 +90,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 - macOS: Fix :opt:`resize_in_steps` not working correctly on high DPI screens
   (:iss:`4114`)
 
+- Fix the :program:`resize OS Windows <kitty @ resize-os-window>` setting a
+  slightly incorrect size on high DPI screens (:iss:`4114`)
+
 
 0.23.1 [2021-08-17]
 ----------------------

kitty/utils.py

@@ -715,11 +715,11 @@ def get_new_os_window_size(
     if unit == 'cells':
         cw = metrics['cell_width']
         ch = metrics['cell_height']
-        if has_window_scaling:
-            cw = int(cw / metrics['xscale'])
-            ch = int(ch / metrics['yscale'])
         width *= cw
         height *= ch
+        if has_window_scaling:
+            width = round(width / metrics['xscale'])
+            height = round(height / metrics['yscale'])
     if incremental:
         w = metrics['width'] + width
         h = metrics['height'] + height