:set completeopt=menuone does not always show menu on the commandline

Question

:set completeopt=menuone does not always show the menu. For example pressing :vs<tab> on the command line one would expect the menu to appear, with the singular option vsplit. What happens instead is vsplit is imediately completed. How can I prevent this, and instead always show the menu even with only one valid completion?

filbranden · Accepted Answer

The 'completeopt' option only applies to Insert mode completion, which is not really the case when you're completing an Ex command on the Vim command-line.
The completion menu on the Vim command-line is enabled by 'wildmenu' and controlled with the 'wildmode' option.
But the 'wildmode' option doesn't support any setting that will display the completion menu when there's a single candidate for completion. From :help 'wildmode':

When there is only a single match, it is fully completed in all cases.

:set completeopt=menuone does not always show menu on the commandline

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