How to disable reformat on typing?
Answered
Here is an example: the keywords jumping.

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Wierd behaviour appears in RubyMine 2019.X.X. One more example:
Hello,
thank you for the report, I've submitted a corresponding issue so please add your vote to it:
https://youtrack.jetbrains.com/issue/RUBY-25612
As for the 2nd case I didn't manage to reproduce it in 2019.3.2 Preview (the comment sign is indented the same way 'end' keyword was)