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When hitting C-j in the minibuffer while executing helm-find-files and no match is possible, helm creates a new buffer with the name of the completion. E.g. I do M-x helm-find-files, type foo there is only the default match:

helm with default match

Now I hi C-j and a new buffer gets created, named foo. How can I disable this behavior?

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I don't know why you hit C-j on no match in the first place. C-j is used for previewing the content of a file and there is no needs to preview a non-exist file. But to kill the buffer, simply hit C-j again, for example,

C-x C-f non-existent-filename C-j C-j

the first C-j opens a buffer named non-existent-filename and the second kills it. I learnt this by reading the documentation. To read the documentation of helm-find-files, open a helm-find-files session then hit C-h m (this is shown in the mode line), or M-x helm-documentation.

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  • I hit it often because of a mistake. E.g. when I mistype for an existing filename: fop C-j instead of foo C-j; the main problem is that when this new buffer gets created projectile creates a new cache entry for this and I get them when doing a helm-projectile-find-file. – ckruse Mar 16 '17 at 8:56
  • I see though I don't use helm-projectile., thanks for the explanation. – xuchunyang Mar 16 '17 at 12:09
  • helm-projectile should no longer find file with persistent action, only preview it. – Tianxiang Xiong Apr 17 '17 at 18:22

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