LaTeX reader: fix parsing of dimensions beginning with `.`.

E.g., `\kern.1pt`.

Closes #9902.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/Text/Pandoc/Readers/LaTeX/Parsing.hs b/src/Text/Pandoc/Readers/LaTeX/Parsing.hs
index 90190c082..e5382e306 100644
--- a/src/Text/Pandoc/Readers/LaTeX/Parsing.hs
+++ b/src/Text/Pandoc/Readers/LaTeX/Parsing.hs
@@ -885,7 +885,12 @@ dimenarg = try $ do
   optional sp
   ch  <- option False $ True <$ symbol '='
   minus <- option "" $ "-" <$ symbol '-'
-  Tok _ _ s1 <- satisfyTok isWordTok
+  s1 <- option ""
+        (do Tok _ _ s1 <- satisfyTok isWordTok
+            guard (case T.uncons s1 of
+                     Just (c,_) -> isDigit c
+                     Nothing -> False)
+            pure s1)
   s2 <- option "" $ try $ do
           symbol '.'
           Tok _ _ t <-  satisfyTok isWordTok