UI: correct the keymap editor to match the OSKEY label to the platform

scripts/modules/rna_keymap_ui.py

@@ -175,6 +175,8 @@ def draw_kmi(display_keymaps, kc, km, kmi, layout, level):
             sub.prop(kmi, "idname", text="")
 
         if map_type not in {'TEXTINPUT', 'TIMER'}:
+            from sys import platform
+
             sub = split.column()
             subrow = sub.row(align=True)
 
@@ -195,11 +197,21 @@ def draw_kmi(display_keymaps, kc, km, kmi, layout, level):
             subrow = sub.row()
             subrow.scale_x = 0.75
             subrow.prop(kmi, "any", toggle=True)
+
+            # Match text in `WM_key_event_string`.
+            match platform:
+                case "darwin":
+                    oskey_label = "Cmd"
+                case "win32":
+                    oskey_label = "Win"
+                case _:
+                    oskey_label = "OS"
+
             # Use `*_ui` properties as integers aren't practical.
             subrow.prop(kmi, "shift_ui", toggle=True)
             subrow.prop(kmi, "ctrl_ui", toggle=True)
             subrow.prop(kmi, "alt_ui", toggle=True)
-            subrow.prop(kmi, "oskey_ui", text="Cmd", toggle=True)
+            subrow.prop(kmi, "oskey_ui", text=oskey_label, toggle=True)
 
             # On systems that don't support Hyper, only show if it's enabled.
             # Otherwise the user may have a key binding that doesn't work and can't be changed.