Add option to disable indentation in environments

[slideclimb]

Fix #3218

Summary of additions and changes

• Add option to disable indentation in all environments.
• This option can still be overridden for the document environment.

How to test this pull request

Play with indentation settings and format the following text (also see tests):

\begin{document}
    Don't indent this if turned off.
    \begin{some-env}
    Indent this.
    \end{some-env}
\end{document}

• Updated the documentation, or no update necessary
• Added tests, or no tests necessary

[PHPirates]

Nice! seems to work fine. Maybe add to the documentation also our current opinion about removing indentation.

I think moving to the Kotlin UI DSL has to be done by SmartIndentOptionsEditor so out of scope for TeXiFy?

[slideclimb]

I think moving to the Kotlin UI DSL has to be done by SmartIndentOptionsEditor so out of scope for TeXiFy?

Yes indeed. I actually tried doing it just for this component because the binding of the checkboxes is more intuitive in the UI DSL, but couldn't get it to work. At least not without ditching SmartIndentOptionsEditor, which is there for a reason, so I didn't try any further.