Does 'Ensure right margin is not exceeded' work??

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Hello,

I am trying setting and unsetting the mentioned option under 'Code Style'>'python'>'Wrapping and Braces'. In the first place, the demo area on the right doesn't change by changing that option, I would expect the first line which goes beyond the margin to wrap or set an alert or something when the option is enabled.

I have also tried to set that option, and write code myself exceeding the right margin, and nothing happened. Is this what this option is supposed to do?

It is very interesting for me to enable the option in this way, since I only want this for python files. I don't want wrapping in any other kind of file.

Thank you,
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Dmitry Jemerov, Chief Technology Officer, JetBrains