Markdown reader: fix bug parsing fenced code blocks.

Previously parsing would break if the code block
contained a string of backticks of sufficient length
followed by something other than end of line.

Closes #5304.

1 files changed, 24 insertions, 0 deletions

diff --git a/test/command/5304.md b/test/command/5304.md
new file mode 100644
index 000000000..62b2b9ddd
--- /dev/null
+++ b/test/command/5304.md
@@ -0,0 +1,24 @@
+````
+% pandoc -f markdown -t markdown
+``` {.markdown}
+`«sträng»`
+
+`` «sträng» ``
+
+``` «sträng» ```
+
+````«sträng»````
+... 
+```
+^D
+``` {.markdown}
+`«sträng»`
+
+`` «sträng» ``
+
+``` «sträng» ```
+
+````«sträng»````
+... 
+```
+````