LaTeX reader: improve parsing of raw environments.

If parsing fails in a raw environment (e.g. due to special
characters like unescaped `_`), try again as a verbatim
environment, which is less sensitive to special characters.

This allows us to capture special environments that change
catcodes as raw tex when `-f latex+raw_tex` is used.

Closes #6034.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/command/6034.md b/test/command/6034.md
new file mode 100644
index 000000000..af41f2d50
--- /dev/null
+++ b/test/command/6034.md
@@ -0,0 +1,11 @@
+```
+% pandoc -f latex+raw_tex -t native
+\begin{figure*}
+  \centering
+  \begin{overpic}{test_pic}
+    \put (70,80) {Caption}
+  \end{overpic}
+\end{figure*}
+^D
+[RawBlock (Format "latex") "\\begin{figure*}\n  \\centering\n  \\begin{overpic}{test_pic}\n    \\put (70,80) {Caption}\n  \\end{overpic}\n\\end{figure*}"]
+```