because there is a resize array hold reference to the layout.
in webix v4.2.4 line webix_debug.js:4531, there has below code:
var resize = [];
this “resize” array will hold the reference to the view(layout) for some time untill the next call to “webix.ui.resize()”, if the window not resize, “webix.ui.resize()” will not be called,
for some device e.g(phone), the windows will never resized after show, so the view(layout) will never be released, this is not good.