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The following gif shows the behaviour quite nicely:

enter image description here

Whenever I type a space followed by a dot (.) in any mode derived from text-mode, emacs will replace the space with the dot. I could not want this behaviour, but couldn't figure out what causes this behaviour...

Anybody got any ideas?

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    Check what key . is bound to with C-h k .. – Tobias Feb 26 at 10:49
  • Already did. It's self-insert-command – DeX3 Feb 26 at 11:19
  • Maybe you can identify suspicious active minor modes with (mapatoms (lambda (at) (when (and (boundp at) (member at minor-mode-list) (eq (symbol-value at) t)) (message "%s" at)))). – Tobias Feb 26 at 11:55
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    Check the value of post-command-hook. – npostavs Feb 26 at 13:17
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    Do you see the same thing when you start Emacs with emacs -Q (no init file)? If not, bisect your init file to find the culprit. And if it depends on what you've done interactively in your session then provide a recipe to repro the problem, starting from emacs -Q. – Drew Feb 26 at 16:33
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Found the culprit, it was a combination of aggressive-fill-paragraph-mode with whitespace-cleanup-mode. Setting afp-fill-keys to just space explicitly (used to hold space and . by default) fixes the problem.

  (setq afp-fill-keys '(?\ ))

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