### Bug description

Here is the type of output that I get if I activate logging from Pandoc 
````
quarto render --verbose
[1/2] about.qmd
[INFO] Loaded C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\template.patched from C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\template.patched
[INFO] Loaded C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\metadata.html from C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\metadata.html
[INFO] Loaded C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\title-block.html from C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\title-block.html
[INFO] Loaded C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\title-metadata.html from C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\title-metadata.html
[INFO] Loaded C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\toc.html from C:\Users\chris\AppData\Local\Temp\quarto-sessioneaff13ab\68446796\860cba26\toc.html
[INFO] Running filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-init/quarto-init.lua
[INFO] Completed filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-init/quarto-init.lua in 0 ms
[INFO] Running filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/authors/authors.lua
[INFO] Completed filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/authors/authors.lua in 15 ms
[INFO] Running filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-pre/quarto-pre.lua
[INFO] Completed filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-pre/quarto-pre.lua in 31 ms
[INFO] Running filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/crossref/crossref.lua
[INFO] Completed filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/crossref/crossref.lua in 15 ms
[INFO] Running filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/layout/layout.lua
[INFO] Completed filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/layout/layout.lua in 15 ms
[INFO] Running filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-post/quarto-post.lua
[INFO] Completed filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-post/quarto-post.lua in 0 ms
[INFO] Running filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-finalize/quarto-finalize.lua
[INFO] Completed filter C:/Users/chris/Documents/DEV_R/quarto-cli/src/resources/filters/quarto-finalize/quarto-finalize.lua in 15 ms
[INFO] Not rendering RawInline (Format "tex") "\\Users"
[INFO] Not rendering RawInline (Format "tex") "\\chris"
[INFO] Not rendering RawInline (Format "tex") "\\Documents"
[INFO] Not rendering RawInline (Format "tex") "\\DEV"
[INFO] Not rendering RawInline (Format "tex") "\\quarto"
[INFO] Not rendering RawInline (Format "tex") "\\src"
[INFO] Not rendering RawInline (Format "tex") "\\resources"
[INFO] Not rendering RawInline (Format "tex") "\\formats"
[INFO] Not rendering RawInline (Format "tex") "\\html"
[INFO] Not rendering RawInline (Format "tex") "\\templates"
[INFO] Not rendering RawInline (Format "tex") "\\Users"
[INFO] Not rendering RawInline (Format "tex") "\\chris"
[INFO] Not rendering RawInline (Format "tex") "\\Documents"
[INFO] Not rendering RawInline (Format "tex") "\\DEV"
[INFO] Not rendering RawInline (Format "tex") "\\quarto"
[INFO] Not rendering RawInline (Format "tex") "\\src"
[INFO] Not rendering RawInline (Format "tex") "\\resources"
[INFO] Not rendering RawInline (Format "tex") "\\formats"
[INFO] Not rendering RawInline (Format "tex") "\\html"
[INFO] Not rendering RawInline (Format "tex") "\\templates"
````

the last part shows something is off with parsing a file path

After looking into this with @dragonstyle , this comes from the content of the metadata file we are building and passing to Pandoc
Part of the content is 
````yaml
template-partials:
  - 'C:\Users\chris\Documents\DEV_R\quarto-cli\src\resources\formats\html\templates\title-block.html'
  - 'C:\Users\chris\Documents\DEV_R\quarto-cli\src\resources\formats\html\templates\title-metadata.html'
````

Metadata file in YAML has its string values parsed as Markdown (https://pandoc.org/MANUAL.html#option--metadata-file) and this is failling to parse the `template-partials` values because `\` is not escaped as it should in Markdown, so it is seen by Pandoc and rawInline with format tex. 

Probably this fields should either:  
* Use double backslash or forward slash
*  Be removed from the metatafile passed to Pandoc command as they are probably not necessing at rendering time by Pandoc. (only used by Quarto in preprocessing step ?)

Anyway, it is causing no specific issue here, but should be fixed at some point. 

### `quarto check` Output

_No response_

### `quarto tools check` Output

_No response_

### Checklist

- [ ] [formatted your issue](https://yihui.org/issue/#please-format-your-issue-correctly) so it is easier for us to read?
- [ ] included a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [ ] documented the quarto version you're running, by pasting the output from running `quarto check` in the "Quarto Check Output" text area?
- [ ] documented the version of the quarto tools you're running, by providing the output from running `quarto tools check` in the "Quarto Tools Check Output" text area?
- [ ] documented the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [ ] documented which operating system you're running? If on Linux, please provide the specific distribution as well.
- [ ] upgraded to the latest version, including your versions of R, the RStudio IDE, and relevant R packages?
2022-07-12T21:10:41Z
cderv
bug
closed
`template-partials` metadata cause parsing failure logged in Pandoc 
https://github.com/quarto-dev/quarto-cli/issues/1367