Well, one thing we know is that if nothing is done to change any settings, the default window is drawn as a single pane when opened for the first time in a session. Even if there is no way to check that state, it would seem to be a safe assumption and the shrink/expand toggle could be set to the shrink state.
But that's pretty much a guess on my part, and I don't claim to know how the code really works. If there's time to fiddle with it after dealing with more urgent problems, that would be good. Otherwise it's just a persistent nuisance that doesn't actually break anything.
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