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kbdfs: work arround qemu

qemu does not send e0 escape for gray (arrow) keys, no matter
the numlock state. as a work arround, we assume gray key when
numlock is not active.

--- a/sys/src/cmd/aux/kbdfs/kbdfs.c

+++ b/sys/src/cmd/aux/kbdfs/kbdfs.c

@@ -291,6 +291,10 @@

 	if(c >= Nscan)

 		return;

+	/* qemu workarround: emulate e0 for numpad */

+	if(c != 0 && strchr("GHIKMOPQRS", c) != nil)

+		scan->esc1 |= !scan->num;

+

 	if(scan->esc1 && scan->ctl && kbtabctrlesc1[c] != 0)

 		key.r = kbtabctrlesc1[c];

 	else if(scan->esc1 && scan->shift && kbtabshiftesc1[c] != 0)