bug#19636: [TRAMP] global minor mode hangs connection when accessing files in :lighter

[Philippe Vaucher]

> Basically, do nothing if there's no reliable way of getting the
> information yet (we are remote and not connected yet).

Sounds reasonable for me, thanks for reporting the status. I also
recommend to test with the development version of Emacs (aka 26.0.50),
because there have been serious changes in Tramp.

Good idea.

 

> This seems to repair the issue almost always, except for TRAMP 2.2.11
> (the one in emacs 24.5).

Well, I don't see what could be done else here on emacs-devel. What do
you expect us to do else?

Oh, I was just reporting my findings. Not much you can do except keep in mind people *do* call various emacs api on buffer-file inside :lighter or even inside the function that has to decide wether a mode should be on or off, so the emacs api should be resilient to errors reguarding this. Currently it fails kinda catastrophically when you don't check with `file-remote-p` beforehand (emacs hang and one has to furiously press C-g or C-c to get emacs back, and often this is not sufficient as any command you want to type hangs again, so one has to quit).

Philippe