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plan9: disable compose mode after Alt has been pressed

--- a/plan9.c

+++ b/plan9.c

@@ -1080,12 +1080,13 @@

 kbdproc(void *cchan)

 {

 	char buf[128], buf2[128], *s;

-	int kfd, n;

+	int kfd, n, kbin;

 	Rune r;

 	threadsetname("kbdproc");

 	if ((kfd = open("/dev/kbd", OREAD)) < 0)

 		sysfatal("/dev/kbd: %r");

+	kbin = open("/dev/kbin", OWRITE);

 	buf2[0] = 0;

 	buf2[1] = 0;

@@ -1116,6 +1117,9 @@

 				s += chartorune(&r, s);

 				if (utfrune(buf2+1, r) == nil) {

 					if (r == Kalt) {

+						/* magic trick: write Alt scancode to disable the "compose" mode */

+						if (kbin >= 0)

+							write(kbin, "\x46", 1);

 						altdown = true;

 					} else if (r == Kshift) {

 						shiftdown = true;