Since Alex mentions the package line that led you to ido-mode , this answer depends on the answer to your expression below, which may be related to something that happens to you when you do Cx Cf
When I try to visit a new file ...
When your pointer / cursor is at the end of a word, ido will search for a file in the current directory with that name. It can even cross the relative path if it is configured as a file directory structure, for example. show/basis.m
Jon O comment says even if this happens Cj will create a new file for you.
pjammer
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