For WM_CLASS this is mentioned in the ICCCM docs
https://tronche.com/gui/x/icccm/sec-4.html#s-4.1.2.5
(third sentence).
When changing the WM_CLASS from the command line, this is necessary for
window managers to pick it up before applying class-based rules.
---
x.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/x.c b/x.c
index 5828a3b..7287b6b 100644
--- a/x.c
+++ b/x.c
@@ -1132,8 +1132,8 @@ xinit(int cols, int rows)
win.mode = MODE_NUMLOCK;
resettitle();
- XMapWindow(xw.dpy, xw.win);
xhints();
+ XMapWindow(xw.dpy, xw.win);
XSync(xw.dpy, False);
clock_gettime(CLOCK_MONOTONIC, &xsel.tclick1);
--
2.20.1
