Right margin
There are 2 options connected to right margin:
Editor -> Appearance -> Show right margin
and
Code style -> General -> Right margin (columns)
However you can set only one value for right margin.
According to PSR-2 ( at https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md ) :
There MUST NOT be a hard limit on line length; the soft limit MUST be 120 characters; lines SHOULD be 80 characters or less.
It would be nice if you can set 2 right margin values and display 2 lines - I would like to set 80 and 120 characters and display those 2 lines but at the moment it's not possible (I believe).
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Please feel free to create a request for this feature in youtrack,http://youtrack.jetbrains.com/issues/IDEA
I've added comment here: http://youtrack.jetbrains.com/issue/IDEA-99875 - it seems it was asked for other users quite long time ago but there is no action more and it has not been implemented
@geometry dash
PSR-2 recommends a soft limit of 120 characters and suggests that lines should ideally stay within 80 characters, implying two visual guidelines rather than one strict boundary.