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add riow-skip-redundan: skip redundant k event

immediately followed by a c event; this fixes leaking the
key combo with mod+number or others, for instance when a
vnc window is in focus. unshifted, the following c event
will be identicaly as the k one

--- /dev/null

+++ b/riow-skip-redundant

@@ -1,0 +1,13 @@

+diff 06c482ecc7e168719718ba8e853261265b4a3cbd uncommitted

+--- a//sys/src/cmd/riow.c

++++ b//sys/src/cmd/riow.c

+@@ -377,6 +371,9 @@

+ 			return 0;

+ 		}

+ 	}

++	/* skip redundant event */

++	if(c == 'k' && (mod & Mshift) == 0)

++		return 0;

+ 	/* mod4 + shift + 1…0 yields a shifted value on 'c': workaround */

+ 	if(c == 'k' && mod == (Mmod4|Mshift) && r >= '0' && r <= '9'){

+ 		vdaction(r - '0');