AucTeX's TeX-next-error doesn't display any of the errors listed in the output buffer, only "No more errors".
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I'm running Emacs 26.1 without any "strange" configuration: a bare bone Ubuntu 19.04 emacs package with few packages installed from elpa or melpa. I have the following issue: when pressing space bar ...
Edited question of August 2017:
After a long search I found the reason, why a wonderful software called pdfsizeopt (for my question from April 2017 see below) does not work, when called from Emacs, ...