LaTeX writer: make alignment work within multirow in tables.

Closes #10772.

Author: jgm

src/Text/Pandoc/Writers/LaTeX/Table.hs

@@ -367,6 +367,10 @@ cellToLaTeX blockListToLaTeX isSimpleTable colCount celltype annotatedCell = do
                                <> braces ("%\n" <> x)
                                   -- linebreak for readability
   let hasColWidths = not (all (== ColWidthDefault) colWidths)
+  let aligncmd = case specAlign of
+                   AlignCenter -> "\\centering\\arraybackslash "
+                   AlignRight -> "\\raggedright\\arraybackslash "
+                   _ -> mempty
   let inMultiRow x = case rowspan of
                        (RowSpan 1) -> x
                        (RowSpan n) -> let nrows = literal (tshow n)
@@ -375,7 +379,7 @@ cellToLaTeX blockListToLaTeX isSimpleTable colCount celltype annotatedCell = do
                                              (if hasColWidths
                                                  then "=" -- max width
                                                  else "*") -- natural width
-                                         <> braces x
+                                         <> braces (aligncmd <> x)
   return . inMultiColumn . inMultiRow $ result
 
 -- | Returns the width of a cell spanning @n@ columns.

test/tables/planets.latex

@@ -17,17 +17,18 @@ temperature (C) & Number of moons & Notes \\
 \bottomrule\noalign{}
 \endlastfoot
 \multicolumn{2}{@{}c}{%
-\multirow{4}{*}{Terrestrial planets}} & Mercury & 0.330 & 4,879 & 5427 & 3.7 &
-4222.6 & 57.9 & 167 & 0 & Closest to the Sun \\
+\multirow{4}{*}{\centering\arraybackslash Terrestrial planets}} & Mercury &
+0.330 & 4,879 & 5427 & 3.7 & 4222.6 & 57.9 & 167 & 0 & Closest to the Sun \\
 & & Venus & 4.87 & 12,104 & 5243 & 8.9 & 2802.0 & 108.2 & 464 & 0 & \\
 & & Earth & 5.97 & 12,756 & 5514 & 9.8 & 24.0 & 149.6 & 15 & 1 & Our world \\
 & & Mars & 0.642 & 6,792 & 3933 & 3.7 & 24.7 & 227.9 & -65 & 2 & The red
 planet \\
-\multirow{4}{*}{Jovian planets} & \multirow{2}{*}{Gas giants} & Jupiter & 1898 &
-142,984 & 1326 & 23.1 & 9.9 & 778.6 & -110 & 67 & The largest planet \\
+\multirow{4}{*}{\centering\arraybackslash Jovian planets} &
+\multirow{2}{*}{\centering\arraybackslash Gas giants} & Jupiter & 1898 & 142,984
+& 1326 & 23.1 & 9.9 & 778.6 & -110 & 67 & The largest planet \\
 & & Saturn & 568 & 120,536 & 687 & 9.0 & 10.7 & 1433.5 & -140 & 62 & \\
-& \multirow{2}{*}{Ice giants} & Uranus & 86.8 & 51,118 & 1271 & 8.7 & 17.2 &
-2872.5 & -195 & 27 & \\
+& \multirow{2}{*}{\centering\arraybackslash Ice giants} & Uranus & 86.8 & 51,118
+& 1271 & 8.7 & 17.2 & 2872.5 & -195 & 27 & \\
 & & Neptune & 102 & 49,528 & 1638 & 11.0 & 16.1 & 4495.1 & -200 & 14 & \\
 \multicolumn{2}{@{}c}{%
 Dwarf planets} & Pluto & 0.0146 & 2,370 & 2095 & 0.7 & 153.3 & 5906.4 & -225 & 5