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mouse: fix cursor redraw to prevent screen blanking (thanks erik)

--- a/sys/src/9/port/devmouse.c

+++ b/sys/src/9/port/devmouse.c

@@ -517,6 +517,9 @@

 static void

 mouseproc(void*)

 {

+	ulong counter;

+

+	counter = ~0;

 	while(waserror())

 		;

 	for(;;){

@@ -524,10 +527,11 @@

 			mouse.redraw = 0;

 			cursoroff();

 			cursoron();

-			drawactive(1);

-		} else {

-			drawactive(0);

 		}

+

+		drawactive(mouse.counter != counter);

+		counter = mouse.counter;

+

 		tsleep(&mouse.redrawr, shouldredraw, 0, 20*1000);

 	}

 }