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mothra: use pldraw() to put cmd box on screen for alt display

the cmd box is not part of the alt display hirarchy. for command
typing to show the box in alt display, we call pldraw() on it
in eresized() to initialize its cmd->b image so it knows where to
draw itself on typing.

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

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

@@ -330,7 +330,6 @@

 	bullet=allocimage(display, Rect(0,0,25, 8), screen->chan, 0, DWhite);

 	fillellipse(bullet, Pt(4,4), 3, 3, display->black, ZP);

 	mkpanels();

-

 	unlockdisplay(display);

 	eresized(0);

 	drawlock(1);

@@ -467,7 +466,7 @@

 	r=screen->r;

 	plpack(root, r);

 	plpack(alt, r);

-	draw(screen, r, display->white, 0, ZP);

+	pldraw(cmd, screen);	/* put cmd box on screen for alt display */

 	pldraw(root, screen);

 	flushimage(display, 1);

 	drawlock(0);

@@ -696,7 +695,7 @@

 		exits(0);

 	}

 	plinitentry(cmd, EXPAND, 0, "", docmd);

-	if(defdisplay) pldraw(cmd, screen);

+	pldraw(root, screen);

 }

 void hiturl(int buttons, char *url, int map){