(svn r12749) -Codechange: store the viewport information in the windows that have a viewport instead of one global array with a viewport for each window, even when they do not use the viewport.

src/window_gui.h

@@ -409,6 +409,7 @@ struct vp_d {
 	int32 scrollpos_y;
 	int32 dest_scrollpos_x;
 	int32 dest_scrollpos_y;
+	ViewPort vp_data;          ///< Screen position and zoom of the viewport
 };
 assert_compile(WINDOW_CUSTOM_SIZE >= sizeof(vp_d));