Variable name change

win::destroyed to win::destroying, because it make slightly more sense.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/win.h

@@ -130,8 +130,9 @@ struct win {
   bool reg_ignore_valid;
   /// Cached width/height of the window including border.
   int widthb, heightb;
-  /// Whether the window has been destroyed.
-  bool destroyed;
+  /// Whether the window is being destroyed. This being true means destroy_win
+  /// is called, but window might still need to be faded out
+  bool destroying;
   /// Whether the window is bounding-shaped.
   bool bounding_shaped;
   /// Whether the window just have rounded corners.