Set subwindow size when detaching.

Properly compute window ypos from X geometry spec.

src/partiviewc.cc

@@ -316,10 +316,12 @@ char *parti_detachview( char *how ) {
 	w = make_view_window();
 	if(ppui.view && ppui.view->w() * ppui.view->h() > 0) {
 	    ppui.freemain->fullscreen_off(50, 50, ppui.view->w(), ppui.view->h());
+	    w->size( ppui.view->w(), ppui.view->h() );
 	} else {
 	    ppui.freemain->fullscreen_off(50, 50, 512, 512);
 	}
 	ppui.freemain->show();
+	if(w->window() && w->window()->visible()) w->show();
 	break;
 
   default:
@@ -394,7 +396,7 @@ char *parti_winsize( CONST char *newsize ) {
 	ny = nx * oy / ox;
     if(posp && 4 == sscanf(posp, "%1[-+]%d%1[-+]%d", cx, &posx, cy, &posy)) {
 	if(cx[0] == '-') posx = Fl::w() - nx - posx;
-	if(cy[0] == '-') posy = Fl::w() - ny - posy;
+	if(cy[0] == '-') posy = Fl::h() - ny - posy;
 	has_pos = 1;
     }
     if(ox < 0) {		/* Not yet available -- remember for later */