summary changed

• summary changed from [patch] [cla] BorderContainer splitter width/height not being computed to [patch] [cla] BorderContainer: splitter width/height not being computed

Can you attach a test case? If BorderContainer initializes inside a hidden <div> there are more problems than just the splitter width. It won't be able to compute the size of any of the border panes. It sounds like this is a dup of #5672.