Tab completion for filenames should work too when we are typing custom commands

[hboon]

eg.

<tab> here provides suggestions

in appstore.ts<tab>

<tab> here, the suggestions appear and disappears quickly:

/user:iterate in appstore.ts<tab>

[hboon]

Just found out about @file. That doesn't work with custom commands too.

[github-actions[bot]]

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