Well, usually I avoid modifying the Vim source code so I was a bit surprised to see this and could not remember why I made this change. All I can come up with is this commit message, which describes the change:
Avoid display corruption on :vsp and 'go' changes
Always redraw the screen when splitting vertically or when the 'go'
option is modified (it may e.g. cause scrollbars to hide/show).
So, it seems to be related to vertical splitting. Perhaps there is a better way to solve the problem?
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