LaTeX writer: always use a minipage for cells with line breaks...

if width information is available.  Otherwise the way we treat them can
lead to content that overflows a cell.

Closes #7393.

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

@@ -26,7 +26,8 @@ import Text.DocLayout
   ( Doc, braces, cr, empty, hcat, hsep, isEmpty, literal, nest
   , text, vcat, ($$) )
 import Text.Pandoc.Shared (blocksToInlines, splitBy, tshow)
-import Text.Pandoc.Walk (walk)
+import Text.Pandoc.Walk (walk, query)
+import Data.Monoid (Any(..))
 import Text.Pandoc.Writers.LaTeX.Caption (getCaption)
 import Text.Pandoc.Writers.LaTeX.Notes (notesToLaTeX)
 import Text.Pandoc.Writers.LaTeX.Types
@@ -261,8 +262,12 @@ cellToLaTeX blockListToLaTeX celltype annotatedCell = do
         Para{}  -> True
         Plain{} -> True
         _       -> False
+  let hasLineBreak LineBreak = Any True
+      hasLineBreak _ = Any False
   result <-
-    if not hasWidths || (celltype /= HeaderCell && all isPlainOrPara blocks)
+    if not hasWidths || (celltype /= HeaderCell
+                           && all isPlainOrPara blocks
+                           && not (getAny (query hasLineBreak blocks)))
        then
          blockListToLaTeX $ walk fixLineBreaks $ walk displayMathToInline blocks
        else do

test/command/7272.md

@@ -18,7 +18,10 @@
   >{\raggedright\arraybackslash}p{(\columnwidth - 0\tabcolsep) * \real{1.00}}@{}}
 \toprule
 \endhead
-{\vtop{\hbox{\strut  text}\hbox{\strut text2 }}} \\
+\begin{minipage}[t]{\linewidth}\raggedright
+{ text\\
+text2 }
+\end{minipage} \\
 \bottomrule
 \end{longtable}
 ```