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devcons: we have to ignore modifier keys, just as kbdfs for raw mode

--- a/kern/devcons.c

+++ b/kern/devcons.c

@@ -299,16 +299,27 @@

 	static int collecting, nk;

 	static Rune kc[5];

-	 if(c == Kalt){

-		 collecting = 1;

-		 nk = 0;

-		 return 0;

-	 }

+	switch(c){

+	case 0:

+	case Kcaps:

+	case Knum:

+	case Kshift:

+	case Kaltgr:

+	case Kmod4:

+	case Kctl:

+		/* ignore modifiers */

+		return 0;

-	 if(!collecting){

-		 _kbdputc(c);

-		 return 0;

-	 }

+	case Kalt:

+		collecting = 1;

+		nk = 0;

+		return 0;

+	}

+

+	if(!collecting){

+		_kbdputc(c);

+		return 0;

+	}

 	kc[nk++] = c;

 	c = latin1(kc, nk);