LaTeX reader: fix spurious paragraph breaks in math environments (#11265)

Previously, a math environment with extra space before the
`\end` would get rendered with a blank line, which LaTeX
treats as a paragraph break.

Signed-off-by: Emmanuel Ferdman <[email protected]>

1 files changed, 38 insertions, 0 deletions

diff --git a/test/command/latex-math-trailing-space.md b/test/command/latex-math-trailing-space.md
new file mode 100644
index 000000000..6502b120a
--- /dev/null
+++ b/test/command/latex-math-trailing-space.md
@@ -0,0 +1,38 @@
+Test that trailing spaces before \end{equation} don't create spurious paragraph breaks:
+
+```
+% pandoc -f latex -t latex
+\begin{equation}
+  a
+ \end{equation}
+^D
+\begin{equation}
+  a
+\end{equation}
+```
+
+Same for align environment:
+
+```
+% pandoc -f latex -t latex
+\begin{align}
+  x &= y \\
+ \end{align}
+^D
+\begin{align}
+  x &= y \\
+\end{align}
+```
+
+Test with multiple trailing spaces:
+
+```
+% pandoc -f latex -t latex
+\begin{equation}
+  a + b
+   \end{equation}
+^D
+\begin{equation}
+  a + b
+\end{equation}
+```