LaTeX writer: allow alt text in figure to wrap.

Closes #11924.

test/command/5116.md

@@ -12,7 +12,8 @@
 ^D
 \begin{figure}
 \centering
-\pandocbounded{\includegraphics[keepaspectratio,alt={This is a figure.}]{img.jpg}}
+\pandocbounded{\includegraphics[keepaspectratio,alt={This is a
+figure.}]{img.jpg}}
 \caption{This is a figure.}
 \end{figure}
 
@@ -50,7 +51,8 @@ Right & Left & Center & Default \\
 \begin{figure}
 \centering
 \caption{This is a figure.}
-\pandocbounded{\includegraphics[keepaspectratio,alt={This is a figure.}]{img.jpg}}
+\pandocbounded{\includegraphics[keepaspectratio,alt={This is a
+figure.}]{img.jpg}}
 \end{figure}
 
 \begin{longtable}[]{@{}rlcl@{}}
@@ -86,7 +88,8 @@ Right & Left & Center & Default \\
 ^D
 \begin{figure}
 \centering
-\pandocbounded{\includegraphics[keepaspectratio,alt={This is a figure.}]{img.jpg}}
+\pandocbounded{\includegraphics[keepaspectratio,alt={This is a
+figure.}]{img.jpg}}
 \caption{This is a figure.}
 \end{figure}
 

test/command/6821.md

@@ -60,7 +60,8 @@
 
 \begin{figure}
 \centering
-\pandocbounded{\includegraphics[keepaspectratio,alt={This is a test x = 5}]{test.png}}
+\pandocbounded{\includegraphics[keepaspectratio,alt={This is a test x =
+5}]{test.png}}
 \caption{This is a test
 \protect\VERB|\NormalTok{x }\OperatorTok{=} \DecValTok{5}|}
 \end{figure}

test/command/7181.md

@@ -4,7 +4,8 @@
 ^D
 \begin{figure}
 \centering
-\pandocbounded{\includegraphics[keepaspectratio,page=13,trim=1cm,clip,width=4cm,alt={Global frog population.}]{slides.pdf}}
+\pandocbounded{\includegraphics[keepaspectratio,page=13,trim=1cm,clip,width=4cm,alt={Global
+frog population.}]{slides.pdf}}
 \caption{Global frog population.}
 \end{figure}