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vncv: do NOT map Kaltgr to meta, introduce Mod4 (Super) as an extra key to use instead

--- a/sys/src/cmd/vnc/kbdv.c

+++ b/sys/src/cmd/vnc/kbdv.c

@@ -6,7 +6,8 @@

 	Xshift = 0xFFE1,

 	Xctl = 0xFFE3,

 	Xmeta = 0xFFE7,

-	Xalt = 0xFFE9

+	Xalt = 0xFFE9,

+	Xsuper = 0xFFEB,

 };

 static struct {

@@ -41,10 +42,11 @@

 	{KF|10,	0xffc7},

 	{KF|11,	0xffc8},

 	{KF|12,	0xffc9},

+	{Kaltgr, 0xfe03},

 	{Kshift, Xshift},

 	{Kalt, Xalt},

-	{Kaltgr, Xmeta},

+	{Kmod4, Xsuper},

 	{Kctl, Xctl},

 };

@@ -95,7 +97,7 @@

 {

 	char buf[256], k[10];

 	ulong ks;

-	int ctlfd, fd, kr, kn, w, shift, ctl, alt;

+	int ctlfd, fd, kr, kn, w, shift, ctl, alt, mod4;

 	Rune r;

 	snprint(buf, sizeof buf, "%s/cons", display->devdir);

@@ -108,7 +110,7 @@

 	write(ctlfd, "rawon", 5);

 	kn = 0;

-	shift = alt = ctl = 0;

+	shift = alt = ctl = mod4 = 0;

 	for(;;){

 		while(!fullrune(k, kn)){

 			kr = read(fd, k+kn, sizeof k - kn);

@@ -134,6 +136,10 @@

 			shift = !shift;

 			keyevent(v, Xshift, shift);

 			break;

+		case Kmod4:

+			mod4 = !mod4;

+			keyevent(v, Xsuper, alt);

+			break;

 		default:

 			if(r == ks && r < 0x1A){	/* control key */

 				keyevent(v, Xctl, 1);

@@ -176,6 +182,10 @@

 				keyevent(v, Xshift, 0);

 				shift = 0;

 			}

+			if(mod4){

+				keyevent(v, Xsuper, 0);

+				shift = 0;

+			}

 			break;

 		}

 	}

@@ -228,7 +238,7 @@

 					if((r == Kshift) ||

 					   utfrune(buf+1, Kctl) || 

 					   utfrune(buf+1, Kalt) ||

-					   utfrune(buf+1, Kaltgr))

+					   utfrune(buf+1, Kmod4))

 						keyevent(v, runetovnc(r), 1);

 			}

 			break;

@@ -241,7 +251,7 @@

 			}

 			break;

 		case 'c':

-			if(utfrune(buf2+1, Kctl) || utfrune(buf2+1, Kalt) || utfrune(buf2+1, Kaltgr))

+			if(utfrune(buf2+1, Kctl) || utfrune(buf2+1, Kalt) || utfrune(buf2+1, Kmod4))

 				continue;

 			chartorune(&r, buf+1);

 			keyevent(v, runetovnc(r), 1);