rstudio How to enable font ligatures in RStudio?

I still wish there's a simple button to enable it.

Wish granted! We've just added this to RStudio 1.1.

You can try the preview release here:

https://www.rstudio.com/products/rstudio/download/preview/

RStudio now have a build in option for ligatures, you do not need these dirty hack any more, cheers!

[OLD CONTENTS]

Close RStudio
Open [RStudio dir]/www/index.htm (If you are using a Linux distribution, the dir may be /usr/lib/rstudio, thanks for the comment of @CosminSaveanu)
Add following code between <head> and </head>:

<style>*{text-rendering: optimizeLegibility;}</style>
Restart your RStudio.

dirty but works.

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