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Startify unfortunately does not set the buftype option, so the `[noperm]` would be shown, since the buffer is not really a file. (see mhinz/vim-startify#324) So allow to blacklist startify from this setting. To do so, the logic from the tabline extension was refactored out into a separate function that returns true, if the buffer matches `g:airline#extensions#tabline#ignore_bufadd_pat` and that function is then reused for the readonly() function as well.