The last PR (#2522) caused some issues for me, and the author @KSR-Yasuda suggested that this change could be the culprit. `__CtrlSF__` and `[No Name]` tabs appearing, and adding them to `airline#extensions#tabline#ignore_bufadd_pat` just made the whole tabline disappear.
I also use the Startify plugin with session saving, and found that when restoring a session, the tabs would no longer appear until I had visited a buffer again, whereas beforehand they would load up a soon as I opened Vim. So I commented out my entire vimrc, and could reproduce this issue by opening an existing session with `vim -S mysession`. Without this fix, only a single buffer from the session is shown in the tabline.
I'm using regular Vim, version 8.2 on MacOS 12.3.1.
04bf4eabca