Verification Environment
Windows 10 64-bit
IntelliJ IDEA 2017.2
File->Settings->Editor->Code Style->Right margin allows you to set the auto-fold line width, but this setting does not work for comments and other parts that use Japanese.
In Japanese, it's ideal to count one character as two characters wide and return it, but can't you set it up like that?
It is registered below as a known problem of incorrect calculation of the width of full-width characters.
https://youtrack.jetbrains.com/issue/IDEA-150985
Unfortunately, we do not have any plans to revise it at this time.
Log in and vote (click on the thumb-up icon) to prompt the fix.
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