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aux/vga: rescale after loading new mode

Intel VBIOS seem to not update its state unless in graphical
mode, so set the scaling mode after loading new graphical mode.

--- a/sys/src/cmd/aux/vga/vesa.c

+++ b/sys/src/cmd/aux/vga/vesa.c

@@ -277,12 +277,12 @@

 {

 	if(vbe == nil)

 		error("no vesa bios\n");

-	if(vbe->scale != nil)

-		vbe->scale(vga, ctlr);

 	if(vbesetmode(vbe, atoi(dbattr(vga->mode->attr, "id"))) < 0){

 		ctlr->flag |= Ferror;

 		fprint(2, "vbesetmode: %r\n");

 	}

+	if(vbe->scale != nil)

+		vbe->scale(vga, ctlr);

 }

 static void