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catclock: protect black border with clip rectangle and dont print when window is too small

--- a/sys/src/games/catclock.c

+++ b/sys/src/games/catclock.c

@@ -83,7 +83,6 @@

 	Rectangle r = Rect(0,0,Dx(screen->r), Dy(screen->r));

 	catoffs.x=(Dx(r)-CATWID)/2;

 	catoffs.y=(Dy(r)-CATHGT)/2;

-	if(!ptinrect(catoffs, r)) fprint(2, "catclock: window too small, resize!\n");

 	xredraw=1;

 }

@@ -227,6 +226,7 @@

 		if(xredraw){

 			draw(screen, screen->r, display->white, nil, ZP);

 			border(screen, screen->r, 4, display->black, ZP);

+			replclipr(screen, 0, insetrect(screen->r, 4));

 			//bitblt(&screen, screen.r.min, &screen, screen.r, Zero);

 			//border(&screen, screen.r, 4, F);

 		}

-- 

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