Loosen up textsafe impl, add another path to test

Author: dragonstyle

src/resources/filters/quarto-post/pdf-images.lua

@@ -27,7 +27,7 @@ local resolvedUrls = {}
 -- replace invalid tex characters with underscores
 local tex_safe_filename = function(filename)
   -- return filename
-  return filename:gsub('[^%w%.%-]', '-')
+  return filename:gsub("[ <>()|:&;#?*'\\/]", '-')
 end
 
 function pdfImages() 

tests/docs/smoke-all/2023/01/17/online-image-mediabag.qmd

@@ -15,3 +15,8 @@ _quarto:
 ![](https://raw.githubusercontent.com/quarto-dev/quarto-web/main/docs/get-started/hello/rstudio/lter_penguins.png){style="float:right;" fig-alt="Illustration of three species of Palmer Archipelago penguins: Chinstrap, Gentoo, and Adelie. Artwork by @allison_horst." width="401"}
 
 
+## The below is a path with invalid characters
+
+It is important that the path end with `.jpeg`, otherwise the default extension will be appended to the path _before_ it is downloaded and used post download. In the case of PDFs, the default extension is `pdf`.
+
+![Great Pyramid](https://sat02pap004files.storage.live.com/y4m52ot143vPFNPo0C4wwvFwbWGJz9PYvIxAv3aPcZV9KHpimnZ2ErrEafT22gFuFM3lP-nJYiGpwzfq1wJ2X-kPIroYIPqhzYm01Hx6B4x40cPkesS9FVXJvFfkj9mtdBGFOhl1WVJd0xushOybTa9GTYsn-tKZCn7T0IAHSplCK-VBGhncjA-D09aJ-fJ8Ldq?width=256&height=192&cropmode=none&foobar=.jpeg)