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rio: single line scroll up/down with holding shift key

--- a/sys/src/cmd/rio/dat.h

+++ b/sys/src/cmd/rio/dat.h

@@ -343,3 +343,4 @@

 int		menuing;		/* menu action is pending; waiting for window to be indicated */

 int		snarfversion;	/* updated each time it is written */

 int		messagesize;		/* negotiated in 9P version setup */

+int		shiftdown;

--- a/sys/src/cmd/rio/rio.c

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

@@ -345,6 +345,8 @@

 	threadsetname("keyboardthread");

 	while(s = recvp(kbdchan)){

+		if(*s == 'k' || *s == 'K')

+			shiftdown = utfrune(s+1, Kshift) != nil;

 		if(input == nil || sendp(input->ck, s) <= 0)

 			free(s);

 	}

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -618,7 +618,7 @@

 	if(!w->mouseopen)

 		switch(r){

 		case Kdown:

-			n = w->maxlines/3;

+			n = shiftdown ? 1 : w->maxlines/3;

 			goto case_Down;

 		case Kscrollonedown:

 			n = mousescrollsize(w->maxlines);

@@ -632,7 +632,7 @@

 			wsetorigin(w, q0, TRUE);

 			return;

 		case Kup:

-			n = w->maxlines/3;

+			n = shiftdown ? 1 : w->maxlines/3;

 			goto case_Up;

 		case Kscrolloneup:

 			n = mousescrollsize(w->maxlines);

-- 

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