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Try the following: type os.w and then try to complete. The first entry, "wait" has documentation which appears under the completion list. Now type another letter to narrow the list, say "a", or "i". The documentation pane remains on screen but is now detached from the list of completions. Screenshot attached.
Created attachment 73032 [details] screenshot
Not sure it is still relevant with the current version. AFAIK we don't display docstring any more. Closing this as old bug. If this is still a thing, please reopen and accept my apologies.
Thanks for your evaluation Julien. Reporter, if you think your issue is still valid and needs to be addressed, don't hesitate to reopen it with additional information. Closing for now.