Building Distill Blog in RStudio 1.3 results in /rmd_output/{n}/{path} not found error in preview pane

[tjpalanca]

System details

RStudio Edition : Server
RStudio Version : 1.3.959
OS Version      : Debian Linux 9 (stretch)
R Version       : 3.6.1

Steps to reproduce the problem

1. Create a new distill blog.
2. Build the website (using Ctrl + Shift + B) to generate the _site directory.
3. Go to the welcome.Rmd
4. Knit the document by pressing the Knit button or using Ctrl + Shift + K.
5. The document renders correctly, but the preview does not display correctly and shows /rmd_output/{n}/{relative path to _site folder} not found.
6. If you press "Open in Browser", it opens the correct document.

Describe the problem in detail

I am unable to easily build Distill blogs using the new RStudio.

Describe the behavior you expected

I expect the preview to be correct. This happens when I downgrade to RStudio 1.2.

• I have read the guide to submitting good bug reports at https://github.com/rstudio/rstudio/wiki/Writing-Good-Bug-Reports .
• I have installed the latest version of RStudio and confirmed that the issue still persists.
• If I am reporting a RStudio crash, I have included a diagnostics report. https://support.rstudio.com/hc/en-us/articles/200321257-Running-a-Diagnostics-Report
• I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.

[tjpalanca]

For ease of reproduction:

1. Used rocker/geospatial:3.6.1 as base image and installed the current latest RStudio Server version on top of it in the Dockerfile.
2. Installed {distill}
3. Created a new "Distill Blog"
4. Build the Website
5. Attempted to knit welcome.Rmd

Screenshot

When you click "open in browser" it works well.
Downgrading to RStudio Server 1.2 fixes it.

[jmcphers]

Regression from 9fada22

[R-Hannibal]

@tjpalanca, thanks so much for finding and reporting this issue.

We have a fix in place in our latest preview build (available HERE). If you get the chance will you let us know if the issue is resolved for you in that build?

[tjpalanca]

Hello, @R-Hannibal, apologies for the delayed reply.

I can confirm that the issue is resolved!

[R-Hannibal]

Thanks so much for the assist @tjpalanca! I ended up testing this one out myself as well (never used a Distill project before, very cool stuff), entering a verification comment below:

Verified Fixed on: RStudio Version - 1.3.1054, R Version - 4.0.2, Windows - Desktop

Comparison test run between 1.3.959 (current stable) and 1.3.1054 (current preview), on the older version the not found error is produced as described, new build welcome.Rmd is knitting/opening successfully.