win: keep a prev pointer

Save us some iteration when updating the window stack Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
2019-04-03 20:48:46 +01:00
parent a68903b9ef
commit 166ec55778
3 changed files with 44 additions and 45 deletions
--- a/src/win.h
+++ b/src/win.h
@ -137,6 +137,8 @@ struct win {
 	void *shadow_image;
 	/// Pointer to the next lower window in window stack.
 	win *next;
+	/// Pointer to a linked-list pointer that points to this window.
+	win **prev;
 	/// Pointer to the next higher window to paint.
 	win *prev_trans;
 	// TODO rethink reg_ignore