LaTeX writer: support page,trim,clip attributes on images.

These are actually supported by `\includegraphics`, though
this is not well documented. See
https://tex.stackexchange.com/questions/7938/pdflatex-includegraphics-and-multi-page-pdf-files

Partially addresses #7181.

src/Text/Pandoc/Writers/LaTeX.hs

@@ -930,7 +930,7 @@ inlineToLaTeX il@(Image _ _ (src, _))
   | Just _ <- T.stripPrefix "data:" src = do
       report $ InlineNotRendered il
       return empty
-inlineToLaTeX (Image attr _ (source, _)) = do
+inlineToLaTeX (Image attr@(_,_,kvs) _ (source, _)) = do
   setEmptyLine False
   modify $ \s -> s{ stGraphics = True }
   opts <- gets stOptions
@@ -953,18 +953,21 @@ inlineToLaTeX (Image attr _ (source, _)) = do
                                 Height | isJust (dimension Width attr) ->
                                   [d <> "\\textheight"]
                                 _ -> []
-      dimList = showDim Width <> showDim Height
-      dims = if null dimList
-                then empty
-                else brackets $ mconcat (intersperse "," dimList)
+      optList = showDim Width <> showDim Height <>
+                maybe [] (\x -> ["page=" <> literal x]) (lookup "page" kvs) <>
+                maybe [] (\x -> ["trim=" <> literal x]) (lookup "trim" kvs) <>
+                maybe [] (\_ -> ["clip"]) (lookup "clip" kvs)
+      options = if null optList
+                   then empty
+                   else brackets $ mconcat (intersperse "," optList)
       source' = if isURI source
                    then source
                    else T.pack $ unEscapeString $ T.unpack source
   source'' <- stringToLaTeX URLString source'
   inHeading <- gets stInHeading
   return $
     (if inHeading then "\\protect\\includegraphics" else "\\includegraphics") <>
-    dims <> braces (literal source'')
+    options <> braces (literal source'')
 inlineToLaTeX (Note contents) = do
   setEmptyLine False
   externalNotes <- gets stExternalNotes

test/command/7181.md

@@ -0,0 +1,11 @@
+```
+% pandoc -t latex
+![Global frog population.](slides.pdf){page=13,trim=1cm,clip,width=4cm}
+^D
+\begin{figure}
+\centering
+\includegraphics[page=13,trim=1cm,clip,width=4cm]{slides.pdf}
+\caption{Global frog population.}
+\end{figure}
+
+```