With vim or helix mode on, searching the command palette for "split
selection" showed only a `:split selection` entry and hid
`editor: split selection into lines`. The vim interceptor reads the query
as `:split <file>`, and its filename completions were marked exclusive,
which drops every regular match. The same happens for other searches
that start with a filename command, like "edit prediction".
Return the completions as non-exclusive, like every other intercepted
command. They are still listed first, so `:sp foo` + enter behaves the
same.
Closes#64431
dualfroz
0b2a8d3999