commit 0fe460dbd469a1d5b6a7140d0e1801935e4a923b
from: Lucas de Sena <lucas@seninha.org>
via: Hiltjo Posthuma <hiltjo@codemadness.org>
date: Thu Apr  6 18:28:56 2023 UTC

fix BadMatch error when embedding on some windows

When embedded into another window, dmenu will fail with the BadMatch
error if that window have not the same colormap/depth/visual as the
root window.

That happens because dmenu inherits the colormap/depth/visual from
its parent, but draws on a pixmap created based on the root window
using a GC created for the root window (see drw.c).  A BadMatch will
occur when copying the content of the pixmap into dmenu's window.

A solution is to create dmenu's window inside root and then reparent
it if embeded.

See this mail[1] on ports@openbsd.org mailing list for context.

[1]: https://marc.info/?l=openbsd-ports&m=168072150814664&w=2

commit - dfbbf7f6e1b22ccf9e5a45d77ee10995577fb4fc
commit + 0fe460dbd469a1d5b6a7140d0e1801935e4a923b
blob - 4e7df12eee673974038aeefeb2daa4bd8a8a2e60
blob + 62f1089ff4f414c6ccdfc85e07eedbb706aec562
--- dmenu.c
+++ dmenu.c
@@ -685,7 +685,7 @@ setup(void)
 	swa.override_redirect = True;
 	swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
 	swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
-	win = XCreateWindow(dpy, parentwin, x, y, mw, mh, 0,
+	win = XCreateWindow(dpy, root, x, y, mw, mh, 0,
 	                    CopyFromParent, CopyFromParent, CopyFromParent,
 	                    CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);
 	XSetClassHint(dpy, win, &ch);
@@ -700,6 +700,7 @@ setup(void)
 
 	XMapRaised(dpy, win);
 	if (embed) {
+		XReparentWindow(dpy, win, parentwin, x, y);
 		XSelectInput(dpy, parentwin, FocusChangeMask | SubstructureNotifyMask);
 		if (XQueryTree(dpy, parentwin, &dw, &w, &dws, &du) && dws) {
 			for (i = 0; i < du && dws[i] != win; ++i)