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mothra: flushdisplay before reading event

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

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

@@ -360,6 +360,7 @@

 			}

 		}

+		flushimage(display, 1);

 		unlockdisplay(display);

 		i=event(&e);

 		lockdisplay(display);

@@ -740,7 +741,6 @@

 }

 void filter(char *cmd, int fd){

-	flushimage(display, 1);

 	switch(rfork(RFFDG|RFPROC|RFMEM|RFNOWAIT)){

 	case -1:

 		message("Can't fork!");

@@ -755,7 +755,6 @@

 	close(fd);

 }

 void gettext(Www *w, int fd, int type){

-	flushimage(display, 1);

 	switch(rfork(RFFDG|RFPROC|RFMEM|RFNOWAIT)){

 	case -1:

 		message("Can't fork, please wait");