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Make ctrl+g focus text windows and cycle zeroxed copies (thanks kvik)

--- a/sys/man/1/sam

+++ b/sys/man/1/sam

@@ -723,6 +723,9 @@

 .PP

 Ctrl+b switches to the command window and moves to the end

 of the text.

+Ctrl+g switches from to the last focused window.

+If the focused window is a text window, ctrl+g switches

+to the next zeroxed instance of that window.

 .PP

 The button 3 menu controls window operations.

 The top of the menu

--- a/sys/src/cmd/samterm/main.c

+++ b/sys/src/cmd/samterm/main.c

@@ -485,6 +485,7 @@

 	case Ksoh:

 	case Kenq:

 	case Kstx:

+	case Kbel:

 		return 1;

 	}

 	return 0;

@@ -658,6 +659,22 @@

 		a = t->rasp.nrunes;

 		flsetselect(l, a, a);

 		center(l, a);

+ 	}else if(c == Kbel){

+ 		int i;

+ 		if(work == nil)

+ 			return;

+ 		if(which != work){

+ 			current(work);

+ 			return;

+ 		}

+ 		t = (Text*)work->user1;

+ 		l = &t->l[t->front];

+ 		for(i=t->front; t->nwin>1 && (i = (i+1)%NL) != t->front; )

+ 			if(t->l[i].textfn != 0){

+ 				l = &t->l[i];

+ 				break;

+ 			}

+ 		current(l);

 	}else{

 		if(c==Kesc && typeesc>=0){

 			l->p0 = typeesc;

--- a/sys/src/cmd/samterm/samterm.h

+++ b/sys/src/cmd/samterm/samterm.h

@@ -7,7 +7,9 @@

 enum{

 	Up,

-	Down

+	Down,

+

+	Kbel=0x7,

 };

 typedef struct Text	Text;