Content not full-size on first paint #820
Description
I've noticed an issue on the most recent version (1.20.2) where the allotment component doesn't seem to initially paint at the full width of its content. See the video below of the storybook where I am repeatedly pressing the "remount" button. This happens quite fast, but if you pay close attention, you'll see the width of the grey container is initially quite small, then quickly "snaps" into its full-size.
It's almost as if JS is being used to calculate the width of the content, (which I believe will always be 0 in first render), then sets the width of the allotment panes based on that. Is this fixable? It begins to become fairly noticeable on views where there is a lot of markup to render.