[Bug 39376]

[Meven-q]

Are people still interested in this feature ?

There a mimetype x-trash that seems to cover most extensions you are referring to.
And this is editable using `keditfiletype5 application/x-trash`

It might only come with Dolphin with KF6 though.

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https://bugs.launchpad.net/bugs/39376

Title:
  Allow hidding of backup files

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