Rmarkdown source code disappeared in RStudio

Hi, I'm wondering if anyone knows how to restore Rmarkdown source code in RStudio. I accidently touched some shortcut (don't know which) so that all source code disappeared, a blank editor was shown. Ctrl-Z did not restore the source code. The file on disk has indeed a size of 0 KB. There is an html which I had produced from the source code which has more than 600 KB, but when I try to open it in a browser, a blank page is shown.
Any hint is appreciated (it would help to have at least the html).
(By the way, I hate shortcuts except for a few, there are definitely too many in RStudio).

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