two unrelated little fixes:
bottomwin:
	if bottom was used a few times, rio lost track of the window
	ordering, because w->topped was zero for several windows.
	setting it to a lower (negative) number each time fixes that.

deleting windows:
	a change so that if you point to a window to delete it,
	releasing the button off the window aborts the action.
	yes, it is possible to do this by chording with another
	button, but i feel this way is more intuitive and less easy
	to muck up (important when you might lose important info).
	BTW, i think the cursor when deleting a window should be distinguished,
	as it was in 8½ - i'll submit a patch to reinstitute the old bones
	cursor, if it's not considered a bad idea.

Reference: /n/sources/patch/applied/riotopped.delete
Date: Thu Mar  9 18:36:02 CET 2006

--- /sys/src/cmd/rio/rio.c	Thu Mar  9 18:26:04 2006
+++ /sys/src/cmd/rio/rio.c	Thu Mar  9 18:25:51 2006
@@ -517,7 +517,7 @@
 					scrolling = mouse->buttons;
 				else
 					scrolling = mouse->buttons && ptinrect(xy, winput->scrollr);
-				/* topped will be zero if window has been bottomed */
+				/* topped will be zero or less if window has been bottomed */
 				if(sending == FALSE && !scrolling && winborder(winput, mouse->xy) && winput->topped>0){
 					moving = TRUE;
 				}else if(inside && (scrolling || winput->mouseopen || (mouse->buttons&1)))
@@ -566,7 +566,7 @@
 				cornercursor(w, mouse->xy, 0);
 			/* we're not sending the event, but if button is down maybe we should */
 			if(mouse->buttons){
-				/* w->topped will be zero if window has been bottomed */
+				/* w->topped will be zero or less if window has been bottomed */
 				if(w==nil || (w==winput && w->topped>0)){
 					if(mouse->buttons & 1){
 						;
@@ -1018,6 +1018,8 @@
 				w = nil;
 			}
 			readmouse(mousectl);
+			if(w != nil && wpointto(mouse->xy) != w)
+				w = nil;
 		}
 	cornercursor(input, mouse->xy, 0);
 	moveto(mousectl, mouse->xy);	/* force cursor update; ugly */
--- /sys/src/cmd/rio/wind.c	Thu Mar  9 18:27:10 2006
+++ /sys/src/cmd/rio/wind.c	Thu Mar  9 18:26:47 2006
@@ -1268,7 +1268,7 @@
 	if(w!=nil && w->i!=nil && !w->deleted){
 		bottomwindow(w->i);
 		flushimage(display, 1);
-		w->topped = 0;
+		w->topped = - (++topped);
 	}
 }