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page: fix screwed up display when transparency is present

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

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

@@ -52,7 +52,6 @@

 enum{

 	Cground,

-	Cpaper,

 	Cframe,

 	Ctext,

 	Ncols,

@@ -1239,7 +1238,7 @@

 	if((i = p->image) != nil){

 		r = rectaddpt(Rpt(ZP, pagesize(p)), addpt(pos, screen->r.min));

-		zoomdraw(screen, r, ZR, cols[Cpaper], i, i->r.min, zoom);

+		zoomdraw(screen, r, ZR, display->white, i, i->r.min, zoom);

 	} else {

 		r = Rpt(ZP, stringsize(font, p->name));

 		r = rectaddpt(r, addpt(subpt(divpt(subpt(screen->r.max, screen->r.min), 2),

@@ -1266,7 +1265,7 @@

 		draw(screen, rectaddpt(r, d), screen, nil, r.min);

 	else

 		r = ZR;

-	zoomdraw(screen, nr, rectaddpt(r, d), cols[Cpaper], i, i->r.min, zoom);

+	zoomdraw(screen, nr, rectaddpt(r, d), display->white, i, i->r.min, zoom);

 	drawframe(nr);

 }

@@ -1805,7 +1804,6 @@

 		sysfatal("initdraw: %r");

 	Theme th[nelem(cols)] = {

 		[Cground] { "back",	0x777777FF },

-		[Cpaper] { "paper",	DWhite },

 		[Cframe] { "border",	DBlack },

 		[Ctext]	{ "text",	DBlack },

 	};