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test: the popup's stacking and its map state are one observation

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popupabove() took the stacking order from XQueryTree and then the map
state of each child from a round trip of its own.  The daemon raises and
maps between those, in that order and in one flush, so the loop could pair
a stale order -- popup still below the client, where it was created -- with
a fresh IsViewable, and report the raise that had already happened as a
popup stacked below the client.  1 run in 25 under load, which is the worst
kind: often enough to teach you to re-run a red instead of reading it.

Widening the gap to 300ms shows it with no load at all, and shows the fix
is the right one.  Same test, same widener, 15 runs each:

	before	pass=11 fail=4
	after	pass=15 fail=0

XGrabServer is what makes the two one observation, and the widener is then
harmless because nothing can raise inside it.  Unwidened, 20 runs clean.

Nothing about win.c was wrong: the popup does go above, and the test now
only says so when it is looking at a single moment.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Hojun-Cho
2026-08-18 00:22:34 +09:00
parent 65066eef53
commit 46ab39ab95
1 changed files with 8 additions and 1 deletions
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9
tests/xim_live_test.c
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@@ -405,6 +405,9 @@ testcallbacks(Display *dpy, XIM im, Window win)
/*
* The popup is the one viewable override-redirect window on the private
* display; created before the client window, it must still stack above it.
* The order and the map states have to be one observation: the daemon
* raises and maps between two ungrabbed round trips, and a stale order read
* against a fresh map state says the popup is below when it is not.
*/
static int
popupabove(Display *dpy, Window client)
@@ -419,8 +422,11 @@ popupabove(Display *dpy, Window client)
for(;;){
above = 0;
root = DefaultRootWindow(dpy);
if(!XQueryTree(dpy, root, &root, &parent, &kids, &n))
XGrabServer(dpy);
if(!XQueryTree(dpy, root, &root, &parent, &kids, &n)){
XUngrabServer(dpy);
return fail("query the window tree");
}
for(i = 0; i < n; i++){
if(kids[i] == client)
above = 1;
@@ -429,6 +435,7 @@ popupabove(Display *dpy, Window client)
break;
}
XFree(kids);
XUngrabServer(dpy);
if(i < n)
return above || fail("popup is stacked below the client");
if(leftms(deadline) == 0)